import java.util.Scanner;
public class Main {
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    	int line = Integer.parseInt(sc.next());
      	String line1 = sc.next();
      	String line2 = sc.next();
      
      String kekka = "";
      for(int i = 0; i < line; i ++){
        kekka = kekka + line1.substring(i,i+1) + line2.substring(i,i+1);
      }
      System.out.print(kekka);
    }
}
/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