from math import gcd
import sys
sys.set_int_max_str_digits(10**6)

n = input()

d = len(n)
C = [0 for _ in range(10)]
for i in range(d):
    C[int(n[i])] += 1

ans = int(n)
for i in range(10):
    if C[i] == 0:
        continue
    for j in range(i + 1, 10):
        if C[j] == 0:
            continue
        ans = gcd(ans, 9 * (j - i))
print(ans)