import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int t = in.nextInt();
		while(t-->0){
			StringBuffer sb = new StringBuffer(in.next());
			sb.insert(sb.length()/2, in.next());
			System.out.println(sb);
		}
	}

}

/**************************************************************
	Problem: 2010
	User: admin
	Language: Java
	Result: Accepted
	Time:792 ms
	Memory:40380 kb
****************************************************************/