import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner scanner = new Scanner(System.in);

		//入力表示
		String N = scanner.next();
		String S = scanner.next();
		String T = scanner.next();

		//
		char[] a = S.toCharArray();
		char[] b = T.toCharArray();
		StringBuilder sb = new StringBuilder();
		
		for (int i = 0; i < Integer.parseInt(N); i++) {
			
			sb.append(a[i]);
			sb.append(b[i]);

		}
		
		String d = new String(sb);
		System.out.println(d);

		scanner.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