from itertools import product
from math import gcd

sg = input()
g = int(sg)

digits = sorted(map(eval, str(g)))

if len(set(digits)) == 1:
  print(g)
else:
  digits = [i for i in range(10) if sg.find(str(i)) != -1]

  G = g
  for x in product(digits, repeat=2):
    G = abs(gcd(G, 9 * (x[0] - x[1])))
  print(G)