import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner input = new Scanner(System.in); int t = input.nextInt(); input.nextLine(); // 消耗掉上一行输入后的换行符 for(int i = 0; i < t; i++) { int n = input.nextInt(); input.nextLine(); // 消耗掉上一行输入后的换行符 String str = input.nextLine(); StringBuffer reverse = new StringBuffer(); for(int j = n - 1; j >= 0; j--) { reverse.append(str.charAt(j)); } System.out.println(reverse.toString()); } } }