#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

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