# tested

from boa.builtins import sha1, sha256, hash160, hash256


def Main(operation, a, b):

    if operation == "omin":
        return min(a, b)

    elif operation == "omax":
        return max(a, b)

    elif operation == "oabs":
        return abs(a)

    elif operation == "sha1":
        return sha1(a)

    elif operation == "sha256":
        return sha256(a)

    elif operation == "hash160":
        return hash160(a)

    elif operation == "hash256":
        return hash256(a)

    return "unknown"