import sys
import itertools
from math import gcd

sys.set_int_max_str_digits(10 ** 6)
def solve(N):
    Nt = tuple(int(x) for x in N)
    st = set(Nt)

    if len(st) == 1:
        return N

    g = gcd(*[9 * abs(x - y) for x, y in itertools.combinations(st, 2)])
    return gcd(int(N), g)


print(solve(input()))