from math import gcd
from collections import Counter

S=input()
C=Counter(S)

ANS=0

for i in range(10):
    for j in range(i+1,10):
        if C[str(i)]>0 and C[str(j)]>0:
            if "i"==0:
                ANS=gcd(ANS,j)

            else:
                a=(10*j+i)-(10*i+j)
                ANS=gcd(ANS,a)

if ANS==0:
    print(S)
else:
    print(ANS)