import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); for (int i = 0; i < n; i++) { String s1=sc.next(); String s2=sc.next(); System.out.println(s1.substring(0,s1.length()/2)+s2+s1.substring(s1.length()/2,s1.length()) ); } } }
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