#include <bits/stdc++.h>
using namespace std;
template <class F> class y_combinator {
    F f;

   public:
    y_combinator(F&& f) : f(std::forward<F>(f)) {}
    template <class... Args> auto operator()(Args&&... args) const { return f(*this, std::forward<Args>(args)...); }
};
using ll = long long;
using ld = long double;
template <class T, class U = std::less<T>> using prique = std::priority_queue<T, std::vector<T>, U>;
template <class T> T floor(T a, T b) noexcept { return a / b - (a % b && (a ^ b) < 0); }
template <class T> T ceil(T a, T b) noexcept { return floor(a + b - 1, b); }
template <class T> bool chmin(T& x, const T& y) noexcept { return (x > y ? x = y, true : false); }
template <class T> bool chmax(T& x, const T& y) noexcept { return (x < y ? x = y, true : false); }
#define overload4(a, b, c, d, e, ...) e
#define rep1(a) for (long long _i = 0; _i < (a); _i++)
#define rep2(i, a) for (long long i = 0; i < (a); i++)
#define rep3(i, a, b) for (long long i = (a); i < (b); i++)
#define rep4(i, a, b, c) for (long long i = (a); i < (b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep(i, a, b, c) for (long long i = (a); i > (b); i += (c))
#define all(x) std::begin(x), std::end(x)
#define rall(x) std::rbegin(x), std::rend(x)
#define pb push_back
#ifndef LOCAL
#define debug(...)
#endif

void run_case() {
    string S;
    cin >> S;
    sort(rall(S));
    while (S.back() == '0') S.pop_back();
    vector<int> cnt(10);
    int N = S.size();
    if (S == string(N, S.front())) {
        cout << S << "\n";
        return;
    }
    rep(i, N) cnt[S[i] - '0']++;
    int g = 0;
    rep(i, 10) if (cnt[i]) rep(j, i + 1, 10) if (cnt[j]) {
        g = gcd(g, 9 * (j - i));
    }
    vector<int> s;
    for (ll d = 1; d * d <= g; d++) {
        if (g % d == 0) {
            s.pb(d);
            if (d * d < g) s.pb(g / d);
        }
    }
    int ans = 1;
    for (int x : s) {
        ll t = 0;
        rep(i, N) {
            t = (t * 10) + S[i] - '0';
            t %= x;
        }
        if (t == 0) {
            chmax(ans, x);
        }
    }
    cout << ans << endl;
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::fixed(std::cout).precision(16);
    int T = 1;
    // cin >> T;
    while (T--) run_case();
    return 0;
}