#include <iostream>
#include "bits/stdc++.h"
#include <unordered_set>
using namespace std;

int gcd(int a, int b) {
    return b == 0 ? a : gcd(b, a % b);
}

int main() {
    std::string N;
    std::cin >> N;

    std::unordered_set<int> S;
    for (char c : N) {
        S.insert(c - '0');
    }

    if (S.size() == 1) {
        std::cout << N << std::endl;
    } else {
        int G = 0;
        for (int y : S) {
            for (int x : S) {
                if (y > x) {
                    G = __gcd(G, 9 * (y - x));
                }
            }
        }
        std::cout << __gcd(stoi(N), G) << std::endl;
    }

    return 0;
}