import java.util.*;
public class Main {
	public static void main(String[]args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
        String s = sc.next();
      	String t = sc.next();
     
       char[] schar = s.toCharArray();
       char[] tchar = t.toCharArray();
      for(int i=0; i<n; i++){
        System.out.print(schar[i]+""+tchar[i]);
      }
	}
}
/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