import java.util.*;

class Main{
 public static void main(String args[]){
   Scanner scn = new Scanner(System.in);
   int n = scn.nextInt(); 
   String s = scn.next();
   String t = scn.next();
   String st = "";
   for(int i = 0; i<n; i++){
     st += s.substring(i,i+1);
     st += t.substring(i,i+1);
   }
   System.out.println(st);
 }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz