arrow

n = int(input())

high = n - 2
length = 2 * n - 1
points_out = int((n - 1) / 2)
inner_points = n - 2

print("." * points_out + "#" * n + "." * points_out)

for i in range(1, high + 1):
    for j in range(1, length + 1):
        print("." * points_out + "#" + "." * inner_points + "#" + "." * points_out)
        break

print("#" * points_out + "#" + "." * inner_points + "#" + "#" * points_out)

second_high = n - 2
arrow_points_out = 2
points_left_right = int(arrow_points_out / 2)
arrow_points_in = length - 4

for x in range(1, second_high + 1):
    for y in range(1, length + 1):
        print("." * points_left_right + "#" + "." * arrow_points_in + "#" + "." * points_left_right)
        arrow_points_out += 2
        arrow_points_in -= 2
        points_left_right = int(arrow_points_out / 2)
        break

final_points = int((length - 1) / 2)
print("." * final_points + "#" + "." * final_points)