#yuki443

def gcd(a, b):
 while b:
  a, b = b, a % b
 return a
 
n=raw_input()
s=set()

for c in n:
 s.add(int(c))

if len(s) == 1:
 print n
else:
 res=0
 for x in s:
  for y in s:
   if x > y:
	res = gcd(res, 9*(x-y))

 print gcd(res,int(n))