#!/usr/bin/env python3

import fractions
import functools
import itertools
import math

def gcd_of_permutations(n):
    if n < 10:
        return n
    ds = {int(d) for d in str(n)}
    xs = (9 * abs(a - b) for a, b in itertools.combinations(ds, 2))
    g = functools.reduce(math.gcd, xs, 0)
    return math.gcd(g, n) if g != 0 else n


def main():
    print(gcd_of_permutations(int(input())))


if __name__ == '__main__':
    main()