# 3.3 Write a program to prompt for a score between 0.0 and 1.0.
	# If the score is out of range, print an error.
	# If the score is between 0.0 and 1.0, print a grade using the following table:
	# Score Grade
	# >= 0.9 A
	# >= 0.8 B
	# >= 0.7 C
	# >= 0.6 D
	# < 0.6 F
	# If the user enters a value out of range, print a suitable error message and exit.
	# For the test, enter a score of 0.85.
	try:
	sc = raw_input("Enter your score between 0.0 and 1.0 ")
	score = float(sc)
	except:
	if score > 1.0 or score < 0.0:
	print ("Error, the score should be in the range between 0.0 and 1.0")
	quit()
	if score >= 0.9:
	print 'A'
	elif score >= 0.8:
	print 'B'
	elif score >= 0.7:
	print 'C'
	elif score < 0.6:
	print 'F'