from itertools import permutations
from fractions import gcd

g = input()

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

if len(digits) == 1:
  print g
else:
  digit_len = len(str(g))
  digits = map(eval, str(g))
  S = []
  G = g
  for p in permutations(digits, r=digit_len):
    d = int("".join(map(str, p)))
    if d in S:
      continue
    S += [d]
    G = gcd(G, d)
    if G == 1:
      break
  print G