#include <algorithm>
#include <iostream>
#include <numeric>
#include <string>

int main() {
    using namespace std;
    auto divide = [&](string s, int d) -> int {
        int res = 0;
        for (char c : s) { res = (res * 10 + (c - '0')) % d; }
        return res == 0;
    };

    auto perm_gcd = [&](string s) -> string {
        int n = s.size();
        sort(s.begin(), s.end());
        if (s[0] == s[n - 1]) { return s; }
        int dif_gcd = 0, tot = 0;
        for (int i = 0; i < n; i++) {
            int c = s[i] - '0';
            int nc = (i < n - 1) ? s[i + 1] - '0' : c;
            dif_gcd = (dif_gcd == 0) ? nc - c : gcd(dif_gcd, nc - c);
            tot = (tot + c) % 9;
        }
        if (divide(s, dif_gcd * 9)) { return to_string(dif_gcd * 9); }
        if (divide(s, dif_gcd * 3)) { return to_string(dif_gcd * 3); }
        if (divide(s, dif_gcd)) { return to_string(dif_gcd); }
        return "1";
    };

    string s;
    cin >> s;
    cout << perm_gcd(s) << endl;
}