import math
import sys
sys.set_int_max_str_digits(10**5)
S = int(input())

s = set(list(str(S)))
if len(s)==1:
    print(S)
else:
    mn = 10
    for a in s:
        for b in s:
            if a==b:continue
            mn = min(mn,abs(int(a)-int(b)))

    print(math.gcd(9*mn,S))