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

namespace Q5
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var shirina = 2 * n + 1;
            Console.WriteLine(new string('*', shirina));
            Console.WriteLine("{0}{1}{2}", magicString(".*",1), new string(' ', shirina - 4), magicString("*.",1));
            var leviTochki = 2;
            var kliomba = 2 * n - 5;

            for (int i = 0; i < n-2; i++)
            {
                Console.WriteLine("{0}*{1}*{2}", new string('.', leviTochki), new string('@', kliomba), new string('.', leviTochki));
                leviTochki++;
                kliomba-=2;
            }
            Console.WriteLine("{0}*{0}", new string('.',(shirina-1)/2));

            var leviTochki2 = (shirina - 3) / 2;
            var desniTochki2 = leviTochki2;
            var space = 0;

            for (int i = 0; i < n-2; i++)
            {
                Console.WriteLine("{0}*{1}@{1}*{0}", new string('.',leviTochki2), new string(' ', space));
                leviTochki2--;
                space++;
            }
            Console.WriteLine("."+"*" + "{0}" + "*" + ".", new string('@', shirina - 4));
            Console.WriteLine("{0}",new string('*', shirina));
        }

        public static string magicString(string text, int repeatCount)
        {
            string outputText = "";

            for (int i = 0; i < repeatCount; i++)
            {
                outputText = outputText + text;
            }
            return outputText;
        }
    }
}