#include "bits/stdc++.h"
#pragma GCC optimize("Ofast")

// Begin {{{
using namespace std;

#ifndef DEBUG
#define dump(...)
#endif

template <class A, class B> inline bool chmax(A &a, const B &b) { return b > a && (a = b, true); }
template <class A, class B> inline bool chmin(A &a, const B &b) { return b < a && (a = b, true); }

template <class T>
inline vector<T> make_v(const T &initvalue, intmax_t sz) {
    return vector<T>(sz, initvalue);
}

template <class T, class... Args>
inline auto make_v(const T &initvalue, intmax_t sz, Args... args) {
    return vector<decltype(make_v<T>(initvalue, args...))>(sz, make_v<T>(initvalue, args...));
}

constexpr int INF = 0x3f3f3f3f;
constexpr int64_t LINF = 0x3f3f3f3f3f3f3f3fLL;
// }}} End

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string x; cin >> x;

    sort(x.rbegin(), x.rend());

    if (x == string(x.length(), x[0])) {
        cout << -1 << "\n";
    } else if (x.substr(1, x.length() - 1) == string(x.length() - 1, '0')) {
        cout << -1 << "\n";
    } else {
        for (size_t i = x.length() - 1; i >= 1; --i) {
            if (x[i] != x[i - 1]) {
                swap(x[i], x[i - 1]);
                break;
            }
        }
        cout << x << "\n";
    }

    return 0;
}