package com.example; import java.util.Scanner; public class HackerEarth { public static void main(String args[]){ Scanner input = new Scanner(System.in); int test = input.nextInt(); while(test > 0){ int num = input.nextInt(); int[] arr = new int[num]; for(int i = 0 ; i < num ; i++) arr[i] = input.nextInt(); String str = "" + arr[0]; for(int i = 1 ; i < arr.length ; i++) str = str + arr[i]; System.out.println(str); char[] arr1 = new char[str.length()]; for(int i = 0 ; i < str.length(); i++) arr1[i] = str.charAt(i); for(int i = 0 ; i < arr1.length ; i++) System.out.print(arr[i] + " "); } } }