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

signed main(){
  string S; cin >> S;
  int maxv = -1, maxid;
  int minv = 10, minid;
  for( int i = 0; i < S.size(); ++i ){
    if( maxv < S[ i ] - '0' )
      maxv = S[ i ] - '0', maxid = i;
    if( minv > S[ i ] - '0' )
      minv = S[ i ] - '0', minid = i;
  }
  swap( S[ maxid ], S[ minid ] );
  cout << S << endl;
  return 0;
}