from math import gcd

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))
	ans = gcd(int(N), G)
	print(ans)