using System;
using System.Collections.Generic;
class Program
{
    public static List<char> reversedList = new List<char>();
    static void Main()
    {

            double width = double.Parse(Console.ReadLine());
            FirstLine(width);
            SecondLine(width);
            ThirdLine(width);

    }

    public static void FirstLine(double width)
    {
        int counter = 0;
        for (int i = 0; i < 1; i++)
        {
            for (int j = 1; j <= (width + 3) / 2; j++)
            {
                if (j % 2 != 0)
                {
                    Console.Write("#");
                    counter++;
                }
                else if (j % 2 == 0 && j == (width + 3) / 2 && counter % 2 == 0)
                {
                    Console.Write(".");
                }
                else
                {
                    Console.Write("..");
                }
            }
        }
        Console.WriteLine();
    }

    public static void SecondLine(double width)
    {
        int secondCounter = 0;
        int counter = 0;
        for (int i = 0; i < 1; i++)
        {
            for (int j = 1; j <= (width + 3) / 2; j++)
            {
                if (j % 2 != 0 && j != (width + 3) / 2)
                {
                    reversedList.Add('.');
                    reversedList.Add('.');
                    Console.Write("..");
                    secondCounter++;
                }
                else if (j % 2 != 0 && j == (width + 3) / 2 && counter % 2 == 0)
                {
                    reversedList.Add('.');
                    Console.Write(".");
                }
                else if (j % 2 != 0 && j == (width + 3) / 2 && counter % 2 != 0)
                {
                    Console.Write(".");
                }
                else if (secondCounter % 2 == 0 && j == (width + 3) / 2)
                {
                    break;
                }
                else
                {
                    reversedList.Add('#');
                    Console.Write("#");
                    counter++;
                }
            }
        }
        Console.WriteLine();
    }

    private static void ThirdLine(double width)
    {
        int secondCounter = 0;
        for (int i = 0; i < 1; i++)
        {
            for (int j = 1; j <= (width + 3) / 2; j++)
            {
                if (j == 1)
                {
                    Console.Write(".");
                }
                else
                {
                    if (j % 2 != 0 && j!= (width + 3) / 2)
                    {
                        Console.Write("..");
                        secondCounter++;
                    }
                    else if (j % 2 != 0 && j == (width + 3) / 2 && secondCounter % 2 == 0)
                    {
                        Console.Write(".");
                    }
                    else
                    {
                        Console.Write("#");
                    }
                }

            }
        }
        Console.WriteLine();
    }
}