#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s1,s2;
	int n;
	cin>>n;
	for (int i=0;i<n;i++)
	{
		cin>>s1>>s2;
		int m=s1.size();
		int a=m/2;
		s1.insert(a,s2);
		cout<<s1<<endl;
	}
 	return 0;
}