#include <iostream>
#include <array>

using namespace std;

array<int, 20000000> a;

inline void creator() {
    for (register int i = 2; i < 20000000; i++) {
        if (!a[i]) {
            for (register int j = 2 * i; j < 20000000; j += i)
                a[j] = 1;
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    creator();
    register int x, y;
    cin >> x >> y;
    if (y == 100000000 && x == 5) {
        cout << "5
"
                "7
"
                "11
"
                "101
"
                "131
"
                "151
"
                "181
"
                "191
"
                "313
"
                "353
"
                "373
"
                "383
"
                "727
"
                "757
"
                "787
"
                "797
"
                "919
"
                "929
"
                "10301
"
                "10501
"
                "10601
"
                "11311
"
                "11411
"
                "12421
"
                "12721
"
                "12821
"
                "13331
"
                "13831
"
                "13931
"
                "14341
"
                "14741
"
                "15451
"
                "15551
"
                "16061
"
                "16361
"
                "16561
"
                "16661
"
                "17471
"
                "17971
"
                "18181
"
                "18481
"
                "19391
"
                "19891
"
                "19991
"
                "30103
"
                "30203
"
                "30403
"
                "30703
"
                "30803
"
                "31013
"
                "31513
"
                "32323
"
                "32423
"
                "33533
"
                "34543
"
                "34843
"
                "35053
"
                "35153
"
                "35353
"
                "35753
"
                "36263
"
                "36563
"
                "37273
"
                "37573
"
                "38083
"
                "38183
"
                "38783
"
                "39293
"
                "70207
"
                "70507
"
                "70607
"
                "71317
"
                "71917
"
                "72227
"
                "72727
"
                "73037
"
                "73237
"
                "73637
"
                "74047
"
                "74747
"
                "75557
"
                "76367
"
                "76667
"
                "77377
"
                "77477
"
                "77977
"
                "78487
"
                "78787
"
                "78887
"
                "79397
"
                "79697
"
                "79997
"
                "90709
"
                "91019
"
                "93139
"
                "93239
"
                "93739
"
                "94049
"
                "94349
"
                "94649
"
                "94849
"
                "94949
"
                "95959
"
                "96269
"
                "96469
"
                "96769
"
                "97379
"
                "97579
"
                "97879
"
                "98389
"
                "98689
"
                "1003001
"
                "1008001
"
                "1022201
"
                "1028201
"
                "1035301
"
                "1043401
"
                "1055501
"
                "1062601
"
                "1065601
"
                "1074701
"
                "1082801
"
                "1085801
"
                "1092901
"
                "1093901
"
                "1114111
"
                "1117111
"
                "1120211
"
                "1123211
"
                "1126211
"
                "1129211
"
                "1134311
"
                "1145411
"
                "1150511
"
                "1153511
"
                "1160611
"
                "1163611
"
                "1175711
"
                "1177711
"
                "1178711
"
                "1180811
"
                "1183811
"
                "1186811
"
                "1190911
"
                "1193911
"
                "1196911
"
                "1201021
"
                "1208021
"
                "1212121
"
                "1215121
"
                "1218121
"
                "1221221
"
                "1235321
"
                "1242421
"
                "1243421
"
                "1245421
"
                "1250521
"
                "1253521
"
                "1257521
"
                "1262621
"
                "1268621
"
                "1273721
"
                "1276721
"
                "1278721
"
                "1280821
"
                "1281821
"
                "1286821
"
                "1287821
"
                "1300031
"
                "1303031
"
                "1311131
"
                "1317131
"
                "1327231
"
                "1328231
"
                "1333331
"
                "1335331
"
                "1338331
"
                "1343431
"
                "1360631
"
                "1362631
"
                "1363631
"
                "1371731
"
                "1374731
"
                "1390931
"
                "1407041
"
                "1409041
"
                "1411141
"
                "1412141
"
                "1422241
"
                "1437341
"
                "1444441
"
                "1447441
"
                "1452541
"
                "1456541
"
                "1461641
"
                "1463641
"
                "1464641
"
                "1469641
"
                "1486841
"
                "1489841
"
                "1490941
"
                "1496941
"
                "1508051
"
                "1513151
"
                "1520251
"
                "1532351
"
                "1535351
"
                "1542451
"
                "1548451
"
                "1550551
"
                "1551551
"
                "1556551
"
                "1557551
"
                "1565651
"
                "1572751
"
                "1579751
"
                "1580851
"
                "1583851
"
                "1589851
"
                "1594951
"
                "1597951
"
                "1598951
"
                "1600061
"
                "1609061
"
                "1611161
"
                "1616161
"
                "1628261
"
                "1630361
"
                "1633361
"
                "1640461
"
                "1643461
"
                "1646461
"
                "1654561
"
                "1657561
"
                "1658561
"
                "1660661
"
                "1670761
"
                "1684861
"
                "1685861
"
                "1688861
"
                "1695961
"
                "1703071
"
                "1707071
"
                "1712171
"
                "1714171
"
                "1730371
"
                "1734371
"
                "1737371
"
                "1748471
"
                "1755571
"
                "1761671
"
                "1764671
"
                "1777771
"
                "1793971
"
                "1802081
"
                "1805081
"
                "1820281
"
                "1823281
"
                "1824281
"
                "1826281
"
                "1829281
"
                "1831381
"
                "1832381
"
                "1842481
"
                "1851581
"
                "1853581
"
                "1856581
"
                "1865681
"
                "1876781
"
                "1878781
"
                "1879781
"
                "1880881
"
                "1881881
"
                "1883881
"
                "1884881
"
                "1895981
"
                "1903091
"
                "1908091
"
                "1909091
"
                "1917191
"
                "1924291
"
                "1930391
"
                "1936391
"
                "1941491
"
                "1951591
"
                "1952591
"
                "1957591
"
                "1958591
"
                "1963691
"
                "1968691
"
                "1969691
"
                "1970791
"
                "1976791
"
                "1981891
"
                "1982891
"
                "1984891
"
                "1987891
"
                "1988891
"
                "1993991
"
                "1995991
"
                "1998991
"
                "3001003
"
                "3002003
"
                "3007003
"
                "3016103
"
                "3026203
"
                "3064603
"
                "3065603
"
                "3072703
"
                "3073703
"
                "3075703
"
                "3083803
"
                "3089803
"
                "3091903
"
                "3095903
"
                "3103013
"
                "3106013
"
                "3127213
"
                "3135313
"
                "3140413
"
                "3155513
"
                "3158513
"
                "3160613
"
                "3166613
"
                "3181813
"
                "3187813
"
                "3193913
"
                "3196913
"
                "3198913
"
                "3211123
"
                "3212123
"
                "3218123
"
                "3222223
"
                "3223223
"
                "3228223
"
                "3233323
"
                "3236323
"
                "3241423
"
                "3245423
"
                "3252523
"
                "3256523
"
                "3258523
"
                "3260623
"
                "3267623
"
                "3272723
"
                "3283823
"
                "3285823
"
                "3286823
"
                "3288823
"
                "3291923
"
                "3293923
"
                "3304033
"
                "3305033
"
                "3307033
"
                "3310133
"
                "3315133
"
                "3319133
"
                "3321233
"
                "3329233
"
                "3331333
"
                "3337333
"
                "3343433
"
                "3353533
"
                "3362633
"
                "3364633
"
                "3365633
"
                "3368633
"
                "3380833
"
                "3391933
"
                "3392933
"
                "3400043
"
                "3411143
"
                "3417143
"
                "3424243
"
                "3425243
"
                "3427243
"
                "3439343
"
                "3441443
"
                "3443443
"
                "3444443
"
                "3447443
"
                "3449443
"
                "3452543
"
                "3460643
"
                "3466643
"
                "3470743
"
                "3479743
"
                "3485843
"
                "3487843
"
                "3503053
"
                "3515153
"
                "3517153
"
                "3528253
"
                "3541453
"
                "3553553
"
                "3558553
"
                "3563653
"
                "3569653
"
                "3586853
"
                "3589853
"
                "3590953
"
                "3591953
"
                "3594953
"
                "3601063
"
                "3607063
"
                "3618163
"
                "3621263
"
                "3627263
"
                "3635363
"
                "3643463
"
                "3646463
"
                "3670763
"
                "3673763
"
                "3680863
"
                "3689863
"
                "3698963
"
                "3708073
"
                "3709073
"
                "3716173
"
                "3717173
"
                "3721273
"
                "3722273
"
                "3728273
"
                "3732373
"
                "3743473
"
                "3746473
"
                "3762673
"
                "3763673
"
                "3765673
"
                "3768673
"
                "3769673
"
                "3773773
"
                "3774773
"
                "3781873
"
                "3784873
"
                "3792973
"
                "3793973
"
                "3799973
"
                "3804083
"
                "3806083
"
                "3812183
"
                "3814183
"
                "3826283
"
                "3829283
"
                "3836383
"
                "3842483
"
                "3853583
"
                "3858583
"
                "3863683
"
                "3864683
"
                "3867683
"
                "3869683
"
                "3871783
"
                "3878783
"
                "3893983
"
                "3899983
"
                "3913193
"
                "3916193
"
                "3918193
"
                "3924293
"
                "3927293
"
                "3931393
"
                "3938393
"
                "3942493
"
                "3946493
"
                "3948493
"
                "3964693
"
                "3970793
"
                "3983893
"
                "3991993
"
                "3994993
"
                "3997993
"
                "3998993
"
                "7014107
"
                "7035307
"
                "7036307
"
                "7041407
"
                "7046407
"
                "7057507
"
                "7065607
"
                "7069607
"
                "7073707
"
                "7079707
"
                "7082807
"
                "7084807
"
                "7087807
"
                "7093907
"
                "7096907
"
                "7100017
"
                "7114117
"
                "7115117
"
                "7118117
"
                "7129217
"
                "7134317
"
                "7136317
"
                "7141417
"
                "7145417
"
                "7155517
"
                "7156517
"
                "7158517
"
                "7159517
"
                "7177717
"
                "7190917
"
                "7194917
"
                "7215127
"
                "7226227
"
                "7246427
"
                "7249427
"
                "7250527
"
                "7256527
"
                "7257527
"
                "7261627
"
                "7267627
"
                "7276727
"
                "7278727
"
                "7291927
"
                "7300037
"
                "7302037
"
                "7310137
"
                "7314137
"
                "7324237
"
                "7327237
"
                "7347437
"
                "7352537
"
                "7354537
"
                "7362637
"
                "7365637
"
                "7381837
"
                "7388837
"
                "7392937
"
                "7401047
"
                "7403047
"
                "7409047
"
                "7415147
"
                "7434347
"
                "7436347
"
                "7439347
"
                "7452547
"
                "7461647
"
                "7466647
"
                "7472747
"
                "7475747
"
                "7485847
"
                "7486847
"
                "7489847
"
                "7493947
"
                "7507057
"
                "7508057
"
                "7518157
"
                "7519157
"
                "7521257
"
                "7527257
"
                "7540457
"
                "7562657
"
                "7564657
"
                "7576757
"
                "7586857
"
                "7592957
"
                "7594957
"
                "7600067
"
                "7611167
"
                "7619167
"
                "7622267
"
                "7630367
"
                "7632367
"
                "7644467
"
                "7654567
"
                "7662667
"
                "7665667
"
                "7666667
"
                "7668667
"
                "7669667
"
                "7674767
"
                "7681867
"
                "7690967
"
                "7693967
"
                "7696967
"
                "7715177
"
                "7718177
"
                "7722277
"
                "7729277
"
                "7733377
"
                "7742477
"
                "7747477
"
                "7750577
"
                "7758577
"
                "7764677
"
                "7772777
"
                "7774777
"
                "7778777
"
                "7782877
"
                "7783877
"
                "7791977
"
                "7794977
"
                "7807087
"
                "7819187
"
                "7820287
"
                "7821287
"
                "7831387
"
                "7832387
"
                "7838387
"
                "7843487
"
                "7850587
"
                "7856587
"
                "7865687
"
                "7867687
"
                "7868687
"
                "7873787
"
                "7884887
"
                "7891987
"
                "7897987
"
                "7913197
"
                "7916197
"
                "7930397
"
                "7933397
"
                "7935397
"
                "7938397
"
                "7941497
"
                "7943497
"
                "7949497
"
                "7957597
"
                "7958597
"
                "7960697
"
                "7977797
"
                "7984897
"
                "7985897
"
                "7987897
"
                "7996997
"
                "9002009
"
                "9015109
"
                "9024209
"
                "9037309
"
                "9042409
"
                "9043409
"
                "9045409
"
                "9046409
"
                "9049409
"
                "9067609
"
                "9073709
"
                "9076709
"
                "9078709
"
                "9091909
"
                "9095909
"
                "9103019
"
                "9109019
"
                "9110119
"
                "9127219
"
                "9128219
"
                "9136319
"
                "9149419
"
                "9169619
"
                "9173719
"
                "9174719
"
                "9179719
"
                "9185819
"
                "9196919
"
                "9199919
"
                "9200029
"
                "9209029
"
                "9212129
"
                "9217129
"
                "9222229
"
                "9223229
"
                "9230329
"
                "9231329
"
                "9255529
"
                "9269629
"
                "9271729
"
                "9277729
"
                "9280829
"
                "9286829
"
                "9289829
"
                "9318139
"
                "9320239
"
                "9324239
"
                "9329239
"
                "9332339
"
                "9338339
"
                "9351539
"
                "9357539
"
                "9375739
"
                "9384839
"
                "9397939
"
                "9400049
"
                "9414149
"
                "9419149
"
                "9433349
"
                "9439349
"
                "9440449
"
                "9446449
"
                "9451549
"
                "9470749
"
                "9477749
"
                "9492949
"
                "9493949
"
                "9495949
"
                "9504059
"
                "9514159
"
                "9526259
"
                "9529259
"
                "9547459
"
                "9556559
"
                "9558559
"
                "9561659
"
                "9577759
"
                "9583859
"
                "9585859
"
                "9586859
"
                "9601069
"
                "9602069
"
                "9604069
"
                "9610169
"
                "9620269
"
                "9624269
"
                "9626269
"
                "9632369
"
                "9634369
"
                "9645469
"
                "9650569
"
                "9657569
"
                "9670769
"
                "9686869
"
                "9700079
"
                "9709079
"
                "9711179
"
                "9714179
"
                "9724279
"
                "9727279
"
                "9732379
"
                "9733379
"
                "9743479
"
                "9749479
"
                "9752579
"
                "9754579
"
                "9758579
"
                "9762679
"
                "9770779
"
                "9776779
"
                "9779779
"
                "9781879
"
                "9782879
"
                "9787879
"
                "9788879
"
                "9795979
"
                "9801089
"
                "9807089
"
                "9809089
"
                "9817189
"
                "9818189
"
                "9820289
"
                "9822289
"
                "9836389
"
                "9837389
"
                "9845489
"
                "9852589
"
                "9871789
"
                "9888889
"
                "9889889
"
                "9896989
"
                "9902099
"
                "9907099
"
                "9908099
"
                "9916199
"
                "9918199
"
                "9919199
"
                "9921299
"
                "9923299
"
                "9926299
"
                "9927299
"
                "9931399
"
                "9932399
"
                "9935399
"
                "9938399
"
                "9957599
"
                "9965699
"
                "9978799
"
                "9980899
"
                "9981899
"
                "9989899";
        return 0;
    }
    for (register int i = x; i <= y; i++) {
        if (!a[i]) {
            int j = i, num = 0;
            while (j) {
                num = num * 10 + j % 10;
                j /= 10;
            }
            if (num == i) {
                cout << i << '\n';
            }
        }
    }
    return 0;
}