#include<stdio.h>
#include<string.h>

int main()
{
	int n,i,j;
	char a[50],b[50],c[100];
	scanf("%d",&n);
	while(n--)
	{
		scanf("%s%s",a,b);
		for(i=0;i<strlen(a)/2;i++)
			c[i]=a[i];
		for(i=strlen(a)/2,j=0;j<strlen(b);i++,j++)
			c[i]=b[j];
		for(j=strlen(a)/2;a[j]!='\0';i++,j++)
			c[i]=a[j];
		c[i]='\0';
		printf("%s\n",c);
	}
	return 0;
}
/**************************************************************
	Problem: 2010
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/