import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);
		int n = Integer.parseInt(scan.nextLine());
		String s = scan.next();
		String t = scan.next();
		StringBuffer ans = new StringBuffer();
		
		for(int i = 0; i < n; i++) {
			ans.append(s.charAt(i)).append(t.charAt(i));
		}
		
		System.out.println(ans.toString());
		scan.close();
	}
}

/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