# L-8 MCS 260 Fri 29 Jan 2010  grading scale
#
# This program prompts the user to enter a number.
# The corresponding letter grade is printed.
#
n = input('Enter your number : ')
if n >= 90:
   grade = 'A'
elif n >= 80:
   grade = 'B'
elif n >= 70:
   grade = 'C'
elif n >= 60:
   grade = 'D'
else:
   grade = 'F'
print 'Your grade is ' + grade + '.'