#include <bits/stdc++.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cmath>
#include <stack>
#include <queue>
#include <cctype>
#include <stdio.h>
#include <map>
#include <string.h>
#include <utility>

typedef long long ll;
using namespace std;

typedef pair<int, int> P;



int main() {

	string s;
	cin>>s;

	for(int i=9; i>=2; i--){

		for(int j=s.length()-1; j>=0; j--){

			if(s[j]-'0' == i){

				int k=0;
				while(s[j] ==s[k]){
					k++;
				}
				char a = s[k];
				s[k] = s[j];
				s[j] = a;

				cout<<s<<endl;
				return 0;
			}
		}
	}


	return 0;
}