__author__ = 'HOANGTED'
print("Hi")
score = int(input('what is your score?'))
if score >= 90:
    print('grade is A')
elif score >= 80:
    print('grade is B')
elif score >= 70:
    print('grade is C')
elif score >= 60:
    print('grade is D')
else: print('grade is F')
