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

int main(){
  string s; cin >> s;
  int a = s[0]-'0';
  int mx = a;
  for(int i = 1; i < s.size(); i++){
    mx = max(mx, s[i]-'0');
  }
  int at = 0;
  for(int i = 1; i < s.size(); i++){
    if(s[i]-'0'==mx) at = i;
  }
  swap(s[0], s[at]);
  cout << s << endl;
  return 0;
}