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();
        String c = sc.next();

        for(int i=0;i<a;i++){
            System.out.print(b.substring(i,i+1)+c.substring(i,i+1));
        }

    }
}
/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