import sys
import math

def gcd(a, b):
    return a if b == 0 else gcd(b, a % b)

N = input()
S = set()

for c in N:
    S.add(int(c))

if len(S) == 1:
    print(N)
else:
    G = 0
    for y in S:
        for x in S:
            if y > x:
                G = gcd(G, 9 * (y - x))
    print(gcd(int(N), G))