# 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
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