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

int main() {
    string s;
    cin>>s;
    string a="",b="";
    for(int i=0;i<s.size();i++){
        if(islower(s[i])) a+=s[i];
        else b+=s[i];
    }
    reverse(a.begin(),a.end());
    cout<<a<<b<<endl;
}