import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);
		 
		int N = scan.nextInt();
		String A = scan.next();
		String B = scan.next();
 
		char[] ac = A.toCharArray();
		char[] bc = B.toCharArray();
 
		//ArrayList<String> list = new ArrayList<String>();
		StringBuilder sb = new StringBuilder();
		
 
		for(int i = 0; i< N; i++) {
			sb.append(ac[i]);
			sb.append(bc[i]);
		}
		
		System.out.println(sb.toString());
	}
}
/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