class substring{
    str: string;
    constructor(str: string) {
        this.str = str;
    }
    display() {
        for (let i = 0; i < this.str.length; i++){
            console.log(this.str[i]);
        }
    }
    display1() {
        var str1: string = '';
        var l = 2;
        for (let i = 0; i < 2; i++){
            str1 += this.str[i];
        }
        console.log(str1);
        for (let j = 2; j < this.str.length; j++){
            str1 += this.str[j];
            console.log(str1);
        }
    }
}
var s = new substring("abc");
s.display();
s.display1();