from collections import Counter
from itertools import permutations
from math import gcd


def main():
    S = input()
    C = Counter(S)

    if len(C) == 1:
        return S

    keys = C.keys()
    res = int(S)
    for a in keys:
        a = int(a)
        for b in keys:
            b = int(b)
            if a > b:
                res = gcd(res, 9 * (a - b))
    return res


print(main())