import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        while(t-- > 0) {
            int c = in.nextInt();
            in.nextLine();
            String s = in.nextLine();

            String res = new StringBuilder(s).reverse().toString();
            System.out.println(res);
        }
    }
}