import sys
import math

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

S=raw_input()
num = [0]*10

for c in S:
	num[int(c)]+=1

for i in range(10):
	if num[i] == len(S):
		print S
		sys.exit()

G=0
for y in range(10):
	for x in range(y):
		if num[y] and num[x]:
			G = gcd(G, 9*(y-x))

print gcd(int(S),G)