#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cmath>


using namespace std;

int main(){
    //vector<int> v;
    int N;
    string S;
    cin >> S;
    /*
    i) v.push_back(0);
    else{
        while(N > 0){
            v.push_back(N%10);
            N /= 10;
        }
        v.reverse();
    }
    */
    

    vector<char> v;
    for(int i = 0; i< S.size(); i++)
        v.push_back(S[i]);
    auto it = max_element(v.begin(), v.end());
    swap(*it, v[0]);
    if(v.size() > 1){
        auto jt = max_element(v.begin()+1, v.end());
        swap(*jt, v[1]);
    }

    for(int i=0 ;i < v.size(); i++)
        cout << v[i];

    cout << endl;
    
    return 0;
}