import java.util.Scanner;


public class Main {
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)) {
		
			int n = sc.nextInt();
			String s = sc.next();
			String t = sc.next();
			
			for(int i = 0 ; i < n ; i++ ) {
				System.out.print(s.charAt(i));
				System.out.print(t.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