import java.util.Scanner;

public class Main {
	public static void main(String[] args) {	
		Scanner sc= new Scanner(System.in);
		int a = sc.nextInt();
		sc.close();
		for(int i=1;i<=a;i++) {
			for(int j=1;j<=a-i;j++) {
				System.out.print("*");
			}
			for(int k=1;k<=i*2-1;k++) {
				System.out.print("@");
			}
			for(int j=1;j<=a-i;j++) {
				System.out.print("*");
			}
			System.out.println();
		}
		
	}
}

/**************************************************************
	Problem: 1494
	User: admin
	Language: Java
	Result: Accepted
	Time:803 ms
	Memory:40028 kb
****************************************************************/