#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  string n;
  cin >> n;
  string ans = n;
  for (int i = 0; i < n.size(); ++i) {
    for (int j = i+1; j < n.size(); ++j) {
      string ns = n;
      ns[i] = n[j]; ns[j] = n[i];
      ans = max(ans, ns);
    }
  }
  cout << ans << endl;
  return 0;
}