#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	string S;
	cin >> S;
	sort(S.begin(), S.end());
	reverse(S.begin(), S.end());

	int N = S.size();
	bool atta = 0;
	for (int i = N - 1; i >= 1; i--) {
		if (S[i] != S[i - 1]) {
			atta = 1;
			swap(S[i], S[i - 1]);
			break;
		}
	}

	if (!atta) co(-1);
	else if (S[0] == '0') co(-1);
	else co(S);

	Would you please return 0;
}