//yukicoder contest 458 A
#include <bits/stdc++.h>
using namespace std;

int main() {
    string S;
    cin >> S;

    string ans;
    for(char c: S) {
        if(c >= 'A') ans = c + ans;
        else         ans = ans + c;
    }

    cout << ans << endl;
    return 0;
}