import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		String num = sc.nextLine();
		String line = sc.nextLine();
		String[] word = line.split(" ",0);
      for(int i = 0; i < Integer.parseInt(num); i++){
        	System.out.print(word[0].charAt(i));
        	System.out.print(word[1].charAt(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