import sys


sys.set_int_max_str_digits(10 ** 9)

from math import gcd

n = input()
cnt = [0] * 10
for s in n:
    cnt[int(s)] += 1
g = int(n)
for i in range(10):
    if cnt[i] == 0:
        continue
    for j in range(i + 1, 10):
        if cnt[j] == 0 or i == j:
            continue
        
        g = gcd(g, 9 * (j - i))
print(g)