#include <iostream>
#include <numeric>

using namespace std;

bool appear[15];

bool factor(string s, int mod) {
	int x = 0;
	for(char c : s) {
		x = x * 10 + (c - '0');
		x %= mod;
	}
	return !x;
}

int main() {
    string n;
    cin >> n;
    
    for(auto c : n) {
        appear[c - '0'] = true;
    }

    int g = 0;
    for(int i = 0; i <= 9; i++) {
        for(int j = 0; j < i; j++) {
            if(appear[i] and appear[j]) {
                g = gcd(g, 9 * (i - j));
            }
        }
    }

    if(!g) {
        cout << n << endl;

        return 0;
    }

    for(int i = g; i >= 1; i--) {
        if(g % i == 0 and factor(n, i)) {
            cout << i;
            return 0;
        }
    }
}