import random
import time
start = time.time()
S = input()


def gcd(x, y):
    while(y):
        t = x
        x = y
        y = t % y
    return x


a = []

for i in range(10):
    c = chr(i + ord('0'))
    if c in S:
        a.append(i)

g = int(S)
for i in range(len(a)):
    for j in range(i+1, len(a)):
        g = gcd(g, 9*(a[j]-a[i]))
print(g)