def andProduct(a, b):
    a = bin(a)[2:]
    b = bin(b)[2:]
    if len(a) != len(b):
        return 0
    for i in range(len(a)):
        if a[i] != b[i]:
            return int(a[:i] + (len(a) - i) * "0", 2)
    return int(a, 2)