/* -*- coding: utf-8 -*-
 *
 * 927.cc:  No.927 Second Permutation - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 100000;

/* typedef */

typedef long long ll;
typedef vector<int> vi;
typedef queue<int> qi;
typedef pair<int,int> pii;

/* global variables */

char s[MAX_N + 4];

/* subroutines */

/* main */

int main() {
  scanf("%s", s);
  int n = strlen(s);

  sort(s, s + n, greater<char>());

  int k = n - 1;
  for (; k > 0; k--)
    if (s[k] != s[k - 1]) {
      swap(s[k], s[k - 1]);
      break;
    }

  if (k == 0 || s[0] == '0') puts("-1");
  else puts(s);
  return 0;
}