#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000

int main(){
	
	string s;
	cin>>s;
	string ans = s;
	
	rep(i,s.size()){
		rep(j,s.size()){
			string t = s;
			swap(t[i],t[j]);
			ans = max(ans,t);
		}
	}
	cout<<ans<<endl;
	
	return 0;
}