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#!/usr/bin/python

# P2PU - Python Programming 101 - Chapter 6 - Flow Control
# Python for Informatics - Chapter 3 - Conditional Execution
# Exercise 3.3
print '\n# Exercise 3.3\n'
try:
        num = float(raw_input('Enter a number between 0.0 and 1.0: '))
        if num < 0.0 or num > 1.0 : print 'Bad score!'
        elif num >= 0.9 : print 'A'
        elif num >= 0.8 : print 'B'
        elif num >= 0.7 : print 'C'
        elif num >= 0.6 : print 'D'
        else : print 'F'
except:
  print 'Bad score!'