# include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 # define int long long
# define lc u << 1
# define rc u << 1 | 1
# define fi first
# define se second
const int N = 15;

string n;
bool hav[N];
signed main ()
{
//	freopen ("gcd.in", "r", stdin); freopen ("gcd.out", "w", stdout);
    cin >> n;
    for (auto c : n) hav[c - '0'] = 1;
    int g = 0;
    for (int i = 0; i <= 9; i ++ )
    {
    	for (int j = 0; j < i; j ++ )
    	{
    		if (hav[i] && hav[j])
                g = __gcd (g, 9 * (i - j));
        }
    }
    if (!g) return cout << n << "\n", 0;
    for (int i = g; i >= 0; i -- )
    {
    	if (g % i == 0)
    	{
    		int t = 0;
    		for (auto c : n) t = (t * 10 % i + (c - '0')) % i;
    		if (!t) return printf ("%lld\n", i), 0;
		}
	}
    return 0;
}