#include <bits/stdc++.h>

using namespace std;

int main(void) {
  string s;
  cin >> s;

  int p = 0;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] < s[p]) continue;
    p = i;
  }
  
  for (int i = 0; i < p; i++) {
    if (s[i] >= s[p]) continue;
    swap(s[i], s[p]);
    break;
  }
  cout << s << endl;

  return 0;
}