#include <bits/stdc++.h>
using namespace std;

signed main(){
  string S; cin >> S;
  string ans = S;
  for( int i = 0; i < S.size(); ++i )
    for( int j = i + 1; j < S.size(); ++j ){
      string t = S; swap( t[ i ], t[ j ] );
      if( ans < t )
        ans = t;
    }
  cout << ans << endl;
  return 0;
}