Arrow (book)

n = int(input())
outer_dots = int((n - 1) / 2)
inner_dots = n - 2
print("{0}{1}{0}".format("." * outer_dots, "#" * n))

for i in range(n - 2):
  print("{0}#{1}#{0}".format("." * outer_dots, "." * inner_dots))

print("#{0}{1}{0}#".format("#" * outer_dots, "." * inner_dots))

outer_dots = 1
inner_dots = 2 * n - 5

for i in range(n - 2):
  print("{0}#{1}#{0}".format("." * outer_dots, "." * inner_dots))
  outer_dots += 1
  inner_dots -= 2

print("{0}#{0}".format("." * outer_dots))