Illuminati Lock

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());

        System.out.printf("%s%s%s\n", ".".repeat(n), "#".repeat(n), ".".repeat(n));

        for (int i = 0; i < n - 1; i += 2) {
            System.out.printf("%s##%s#%s#%s##%s\n", ".".repeat(n - i - 2), ".".repeat(i), ".".repeat(n - 2), ".".repeat(i), ".".repeat(n - i - 2));
        }

        for (int i = n - 3; i >= 0; i -= 2) {
            System.out.printf("%s##%s#%s#%s##%s\n", ".".repeat(n - i - 2), ".".repeat(i), ".".repeat(n - 2), ".".repeat(i), ".".repeat(n - i - 2));
        }

        System.out.printf("%s%s%s\n", ".".repeat(n), "#".repeat(n), ".".repeat(n));
    }
}