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

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
	int t;
	cin >> t;
	rep(ti, 0, t) {
		int k;
		string s;
		cin >> k >> s;
		int sz = s.size();
		deque<char> q;
		rep(i, 0, sz) q.push_back(s[i]);
		k = min(k, sz);
		rep(i, 0, k) {
			q.push_front(q.front());
			q.pop_back();
		}
		rep(i, 0, sz) cout << q[i];
		cout << endl;
	}
}