Illuminati Lock

using System;

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

            Console.WriteLine("{0}{1}{0}", new string('.', n), new string('#', n));

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

            for (int i = n - 3; i >= 0; i -= 2)
            {
                Console.WriteLine("{0}##{1}#{2}#{1}##{0}", new string('.', n - i - 2), new string('.', i), new string('.', n - 2));
            }

            Console.WriteLine("{0}{1}{0}", new string('.', n), new string('#', n));
        }
    }
}