// I SELL YOU...! 
#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
#include<chrono>
#include<iomanip>
#include<map>
#include<set>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using TP = tuple<ll,ll,ll>;
void init_io(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << setprecision(18);
}
signed main(){
  init_io();
  ll n,m_idx=0;
  string s;
  cin >> s;
  n = s.size();
  vector<string> st;
  st.push_back(s);
  for(int i=0;i<n;i++){
    for(int j=i+1;j<n;j++){
      string tmp = s;
      swap(tmp[i],tmp[j]);
      st.push_back(tmp);
    }
  }
  sort(st.begin(),st.end(),greater<>());
  cout << st.front()<<endl;
}