#include <bits/stdc++.h>
#define PI 3.14159265359
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	string X;
	cin >> X;

	string S = X;
	sort(S.begin(), S.end());
	string R = S;
	reverse(R.begin(), R.end());

	if (S.at(0) == S.at(S.size() - 1)) {
		cout << -1 << endl;
		return 0;
	}

	bool b = false;
	for (int i = R.size()-1; i > 0; i--) {
		if (R.at(i) != R.at(i - 1)) {
			char ch = R.at(i);
			R.at(i) = R.at(i - 1);
			R.at(i - 1) = ch;
			b = true;
			break;
		}
	}
	if (R.at(0) == '0') b = false;

	cout << (b ? R : "-1") << endl;
}