/*package whatever //do not write package name here */

import java.io.*;
import java.util.*;
public class Main {
	public static void main (String[] args) {
	    Scanner s=new Scanner(System.in);
	int n=s.nextInt();
	String ss=s.next();
	String t=s.next();
	
	String s1="";
	
	for(int i=0;i<n;i++)
	s1+=ss.charAt(i)+""+t.charAt(i);
	
	System.out.println(s1);
		}
}
/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