#include <iostream.h>int main(){        int a,b,c,n;        cin>>n;        while(n>0)        {	   cin>>a>>b;	   if(b/100!=0) c=a*1000+b;	   else if(b/10!=0) c=a*100+b;	   else c=a*10+b;	   cout<<c<<endl;	   n--;	}	return 0;}