#include<bits/stdc++.h>
using namespace std;
int main(){
    string s,r = "";
    cin>>s;
    int i;
    for(i = s.size() - 1;i >= 0;i--){
        if(s[i] >= 'A' && s[i] <= 'Z'){
            r = r + s[i];
        }
    }
     
     
    for(i = 0;i < s.size();i++){
        if(s[i] >= 'a' && s[i] <= 'z'){
            r = r + s[i];
        }
    }
     
     
    cout<<r;
    return 0;
}
/**************************************************************
	Problem: 1569
	User: admin
	Language: C++
	Result: Accepted
	Time:25 ms
	Memory:2076 kb
****************************************************************/