XJTU_Python/test/4/5.py

def input_list():
    return list(map(int, input().split()))


def gcd(s1, s2):
    if (s1 % s2 == 0):
        return s2
    else:
        return gcd(s2, s1 % s2)


a = input_list()
print(gcd(a[0], a[1]))