using System.Collections.Generic;
public static void Main(String[] args) {
int testNum = Convert.ToInt32(Console.ReadLine());
String inputString = Console.ReadLine();
for (int k = 0; k < testNum; k++ ){
var chars = inputString.ToCharArray();
for (int i =0; i < chars.Length; i += 2){
Console.WriteLine(inputString[i]);
for (int i = 1; i < chars.Length; i += 2){
Console.WriteLine(inputString[i]);