from itertools import product
from fractions import gcd

sg = input()
g = int(sg)

if len(set(digits)) == 1:
    print(g)
else:
    digits = [i for i in range(10) if sg.find(str(i)) != -1]

    G = g
    for x in product(digits, repeat=2):
        G = abs(gcd(G, 9 * (x[0] - x[1])))
    print(G)