# your code goes here
def solution(n):
	i = 0
	while i < n * 2 - 1:
		c = n - abs((i + 1) - n)
		w = 'D' if c % 2 == 0 else 'd'
		print(w * c)
		i += 1

while True:
	try:
		solution(int(input()))
		print()
	except:
		break