
import java.util.Scanner;

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 s ;
		char t ;
		String str= "";

		for(int i=0;i<N;i++) {
			s = S.charAt(i);
			t = T.charAt(i);
			str += String.valueOf(s) + String.valueOf(t);

		}


		System.out.println(str);
	}

}

/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