using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

                Console.Write(new string('*',n*2+1));
                Console.WriteLine();
                Console.Write(".*");
                Console.Write(new string(' ', n * 2 - 3));
                Console.Write("*.");
                Console.WriteLine();
            for(int i=1;i<=n-2;i++)
            {
                Console.Write(new string('.', i +1));
                Console.Write("*");
                Console.Write(new string('@', (n*2+1)-(i+2)*2));
                Console.Write("*");
                Console.Write(new string('.', i + 1));
                Console.WriteLine();
            }
            Console.Write(new string('.', n));
            Console.Write("*");
            Console.Write(new string('.', n));
            Console.WriteLine();
            for(int i=1;i<=n-2;i++)
            {
                Console.Write(new string('.',n-i));
                Console.Write("*");
                Console.Write(new string(' ', i-1));
                Console.Write("@");

                Console.Write(new string(' ', i - 1));
                Console.Write("*");
                Console.Write(new string('.', n - i));
                Console.WriteLine();

            }
            Console.Write(".*");
            Console.Write(new string('@', n * 2-3 ));
            Console.Write("*.");
            Console.WriteLine();
            Console.Write(new string('*', n * 2+1 ));


        }
    }
}