#include "bits/stdc++.h"
using namespace std;

#define int long long

bool divisible(string& s, int x) {
    int rem = 0;
    for (auto c : s) {
        rem = (rem * 10 + c - '0') % x;
    }
    return rem == 0;
}

void solve(){
    string s;
    cin >> s;
    unordered_set<int> st(s.begin(), s.end());
    if (st.size() == 1) {
        cout << s << "\n";
        return;
    }
    int g = 0;
    for (auto i : s) {
        for (auto j : s) {
            if (i < j) {
                g = __gcd(g, 9LL * (j - i));
            }
        }
    }
    vector<int> divisors;
    for (int i = 1; i * i <= g; i++) {
        if (g % i == 0) {
            divisors.push_back(i);
            if (i != g / i)
                divisors.push_back(g / i);
        }
    }
    sort(divisors.rbegin(), divisors.rend());
    for (auto x : divisors) {
        if (divisible(s, x)) {
            cout << x << "\n";
            return;
        }
    }
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int T = 1;
    // cin >> T;
    while(T--) solve();

    return 0;
}