import java.util.Scanner;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
int na=scan.nextInt();  
String nb=scan.next();
String nc=scan.next();
  
String[] mb=nb.split("");
String[] mc=nc.split("");
  
String[] md=new String[2*na];
for(int i=0;i<na;i++){
    md[2*i]=mb[i];
    md[2*i+1]=mc[i];
}

  String nd=String.join("",md);
  System.out.println(nd);

}
}

/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