
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      String s=sc.nextLine();

int a=Integer.parseInt(s);
      String[] sn=sc.nextLine().split(" ");
String[] mae=sn[0].split("");      
String[] usi=sn[1].split("");      


String result="";

for(int i=0;i<a;i++){
result+=mae[i];
result+=usi[i];

}


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