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

int main() {
  string S;
  cin >> S;
  vector<string> V = {S};
  for (int i = 0; i < S.size(); i++)
    for (int j = 0; j < i; j++) {
      string s = S;
      swap(s.at(i), s.at(j));
      V.push_back(s);
    }
  sort(V.rbegin(), V.rend());
  cout << V.at(0) << "\n";
}