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

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

            int space = n / 2;
            int star = n + 1;
            int innerSpace = n - 1;
            int dot = 2 * n - 2;
            int lambda = 2 * n - 2;
            Console.WriteLine("{0}{1}{0}", new string(' ', space), new string('*', star));
            for (int i = 0; i < n / 2; i++)
            {
                Console.WriteLine("{0}*{1}*{0}", new string(' ', space), new string(' ', innerSpace));
            }
            for (int i = 0; i < n / 2; i++)
            {
                Console.WriteLine("{0}*{1}*{0}", new string(' ', space), new string(' ', innerSpace));
                space--;
                innerSpace += 2;
            }
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("*{0}*", new string('.', dot));
            }

            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("*{0}*", new string('@', lambda));
            }
            Console.WriteLine("{0}", new string('*', 2 * n));
        }
    }
}