#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const long long MAX = 5100000;
const long long INF = 1LL << 60;
const long long MOD = 1'000'000'007LL;
const long long mod = 998244353LL;

using namespace std;
typedef unsigned long long ull;
typedef long long ll;


int main()
{
	string x;
	cin >> x;
	sort(x.rbegin(), x.rend());
	if (prev_permutation(x.begin(), x.end())) {
		if (x[0] == '0') {
			puts("-1");
		}
		else {
			cout << x << endl;
		}
	}
	else {
		puts("-1");
	}
	return 0;
}