n=int(input())
for i in range(2*n):
	if i%2==0:
		print("D",flush=1)
	else:
		print("R",flush=1)
	s=int(input())
	if s==1:
		exit()
	if i==n+1 and s==0:
		print("U",flush=1)
		s=int(input())
		print("R",flush=1)
		s=int(input())
		print("R",flush=1)
		s=int(input())
		print("D",flush=1)
		s=int(input())
		while s==0:
			print("R",flush=1)
			s=int(input())
		exit()