#include <cstdio>
#include <iostream>
#include <string>
using namespace std;

int main(){
    string s;
    int t, l;
    cin >> t;
    while (t--) {
        cin >> l;
        getchar();
        getline(cin, s);
        for (int i = s.size()-1; i >= 0; i--) {
            if (s[i] != ' ') {
                cout << s[i];
            }
        }
        cout << endl;
    }
}