import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		String[] b = sc.next().split("");
		String[] c = sc.next().split("");
		
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < a ; i++) {
			sb.append(b[i]);
			sb.append(c[i]);
		}
		
		String result = sb.toString();
		
		System.out.println(result);
	}
}
/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