package com.company;

/*
    task 5
    problem 7
 */


import java.util.Scanner;

public class Main {

    public static final String INPUT_MESSAGE = "enter n:";
    public static final String FIRST_ERROR_MESSAGE = "input error";
    public static final String SECOND_ERROR_MESSAGE = "error: n is odd";

    public static int getInt(Scanner scanner){
        System.out.println(INPUT_MESSAGE);
        while(true){


            while(!scanner.hasNextInt()){
                System.out.println(FIRST_ERROR_MESSAGE);
                scanner.next();
            }
            int a = scanner.nextInt();

            if(a%2==1){
                return a;
            }
            else{
                System.out.println(SECOND_ERROR_MESSAGE);
            }
        }



    }


    public static void draw(int n, char bg, char fg){
        for(int i = 0; i < n/2; i++){
            for(int j = 0; j < (n-(1+2*i))/2; j++){
                System.out.print(bg);
            }
            for(int j = 0; j < 1+2*i;j++){
                System.out.print(fg);
            }
            for(int j = 0; j < (n-(1+2*i))/2; j++){
                System.out.print(bg);
            }
            System.out.println();
        }
        for(int j = 0; j < n;j++){
            System.out.print(fg);
        }
        System.out.println();

        for(int i = n/2-1; i >= 0; i--){
            for(int j = (n-(1+2*i))/2-1; j >= 0; j--){
                System.out.print(bg);
            }
            for(int j = 0; j < 1+2*i;j++){
                System.out.print(fg);
            }
            for(int j = (n-(1+2*i))/2-1; j >= 0; j--){
                System.out.print(bg);
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = getInt(scanner);

        draw(n,'.','#');
    }
}