using System;
class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());

        int width = n * 2;

        Console.WriteLine("{0}{1}{0}", 
            new string(' ',n/2),new string('*',width/2+1),new string(' ',n/2));

        for (int i = 0; i < n/2+1; i++)
        {
            Console.WriteLine("{0}*{1}*{0}", new string (' ',n/2), new string (' ',n-1));
        }
        // magic
        int magicOne = n / 2 - 1;
        int middleMagic = n+1;
        for (int i = 0; i < n / 2 - 1; i++)
        {
            Console.WriteLine("{0}*{1}*{0}",
                new string(' ', magicOne), new string(' ',middleMagic), new string(' ', magicOne));
            magicOne--;
            middleMagic += 2;
        }
        // 

        
        for (int i = 0; i < n; i++)
        {
            Console.WriteLine("*{0}*",new string ('.',width-2));
        }
        for (int i = 0; i < n; i++)
        {
            Console.WriteLine("*{0}*",new string ('@',width-2));
        }
        // End oF Bottle
        Console.WriteLine(new string ('*',width));
    }
}