#include <bits/stdc++.h>
using namespace std;
 
string operation1(string s){
	return s;
}
 
string operation2(string s){
	string temp = s;
	reverse(s.begin(), s.end());
	string temp2 = s + temp;
	return temp2;
}
 
 
int main() {
	int t; cin >> t;
	while(t--){
		int n; cin >> n;
		string s; cin >> s; int len = s.length();
		string final1 = operation1(s);
		string final2 = operation2(s);
		int x = 0;
		for(int i=0; i<s.length(); i++){
			if(final1[i] < final2[i]){
				x = 1;
				break;
			}
			else if(final1[i] > final2[i]){
				x=2;
				break;
			}
		}
		if(x == 0)cout << final1 << endl;
		else if(x == 1) cout << final1 << endl;
		else if(x==2) cout << final2 << endl;
	}
	return 0;
}

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