#include<iostream> #include<cstring> using namespace std; int main() { int s1,s2,t,i; char a[200],b[200]; cin>>t; getchar(); while(t--){ gets(a); gets(b); s1=strlen(a); s2=strlen(b); if(s1%2!=0){ continue; } for(i=0;i<s1+s2;i++){ if(i<s1/2){ cout<<a[i]; } else if(i<s1/2+s2){ cout<<b[i-s1/2]; } else{ cout<<a[i-s2]; } } cout<<endl; } return 0; }