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