import random
import math

def main():
    s = input()

    shuffle = lambda x: ''.join(random.sample(x, len(x)))

    se = {shuffle(s) for i in range(6)}

    se = tuple(se)
    ans = int(se[0])
    for i in range(1, len(se)):
        ans = math.gcd(ans, int(se[i]))
    print(ans)

if __name__ == "__main__":
    main()