#!/usr/bin/env python3
import math
n = input()
cnt = [ n.count(c) for c in '0123456789' ]
d = int(n)
for a in range(10):
    for b in range(a+1, 10):
        if cnt[a] and cnt[b]:
            d = math.gcd(d, (10*b+a)-(10*a+b))
print(d)