// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    int T; cin >> T;
    while(T --) {
        int k; cin >> k;
        std::string s; cin >> s;
        k = std::min(k, 100);
        while(k --) {
            s = s[0] + s;
            s.pop_back();
        }
        cout << s << '\n';
    }
}