import java.util.Scanner;

class Main{
  public static void main(String args[]){
    Scanner scan=new Scanner(System.in);
    int num=scan.nextInt();
    String a=scan.next();
    String b=scan.next();
    String[] a1=new String[num];
    String[] b1=new String[num];
    a1=a.split("");
    b1=b.split("");
    for(int x=0; x<num; x++){
      System.out.print(a1[x]+b1[x]);
    }
  }
}
/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