import sys
readline=sys.stdin.readline
from math import gcd

N=readline().rstrip()
cnt=[0]*10
for n in N:
    cnt[int(n)]+=1
ans=0
for i in range(10):
    for j in range(i+1,10):
        if cnt[i] and cnt[j]:
            ans=gcd(ans,(j-i)*9)
ans=gcd(int(N),ans)
print(ans)