
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();

			char[] s = S.toCharArray();
			char[] t = T.toCharArray();

			char[] c = new char[2 * N];
			for (int i = 0; i < N; i++) {
				c[2 * i] = s[i];
				c[2 * i + 1] = t[i];
			}

			System.out.println(new String(c));

		}
	}

}

/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