from itertools import permutations
from fractions import gcd
import random

g = input()

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

if len(set(digits)) == 1:
  print g
elif 1 in digits or (any([x != 0 and x%2 == 0 for x in digits]) and any([x%3 == 0 for x in digits])):
  print 1
else:
  digit_len = len(str(g))
  S = []
  G = g
  sg = list(str(g))
  for _ in xrange(256):
    random.shuffle(sg)
    G = gcd(int("".join(sg)), G)
  print G