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();
		String ss = s.substring(0,1);
		String total = ss.concat(t.substring(0,1));

		for(int i = 1; i < n;i++) {
			ss = s.substring(i,i+1);
			total = total.concat(ss);
			total = total.concat(t.substring(i,i+1));
		}

		System.out.println(total);
	}

}
/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