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

class TStripedTowel
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());

        char stripe = '#';
        char space = '.';

        for (int i = 1; i < n; i += 2)
        {
            int check = n;
            int checkTwo = n;
            int checkThree = n;

            for (int j = 1; j <= n; )
            {

                Console.Write(new string(stripe, 1));
                --check;
                ++j;

                if (check >= 2)
                {
                    Console.Write(new string(space, 2));
                    check -= 2;
                    j += 2;
                }
                else if (check == 1)
                {
                    Console.Write(new string(space, 1));
                    check -= 1;
                    j += 1;
                }
                else
                {
                    continue;
                }
            }

            Console.WriteLine();

            for (int m = 1; m <= n; )
            {
                if (checkTwo >= 2)
                {
                    Console.Write(new string(space, 2));
                    checkTwo -= 2;
                    m += 2;
                }
                else if (checkTwo == 1)
                {
                    Console.Write(new string(space, 1));
                    checkTwo -= 1;
                    m += 1;
                }
                if (checkTwo >= 1)
                {
                    Console.Write(new string(stripe, 1));
                    --checkTwo;
                    ++m;
                }

            }

            Console.WriteLine();

            for (int l = 1; l <= n; )
            {
                if (checkThree == n)
                {
                    Console.Write(new string(space, 1));
                    checkThree -= 1;
                    l += 1;
                }

                Console.Write(new string(stripe, 1));
                --checkThree;
                ++l;

                if (checkThree >= 2)
                {
                    Console.Write(new string(space, 2));
                    checkThree -= 2;
                    l += 2;
                }
                else if (checkThree == 1)
                {
                    Console.Write(new string(space, 1));
                    checkThree -= 1;
                    l += 1;
                }
                else
                {
                    continue;
                }
            }
            Console.WriteLine();

        }
        int checkFour = n;
        for (int p = 1; p <= n; )
        {
            Console.Write(new string(stripe, 1));
            --checkFour;
            ++p;

            if (checkFour >= 2)
            {
                Console.Write(new string(space, 2));
                checkFour -= 2;
                p += 2;
            }
            else if (checkFour == 1)
            {
                Console.Write(new string(space, 1));
                checkFour -= 1;
                p += 1;
            }
            else
            {
                continue;
            }
        }
        Console.WriteLine();
    }
}