score = int(input("Please Enter your score:"))

if (score >= 80):
    print("Your score is: A")
elif (score >= 75):
    print("Your score is: B+")
elif (score >= 70):
    print("Your score is: B")
elif (score >= 65):
    print("Your score is: C+")
elif (score >= 60):
    print("Your score is: C")
elif (score >= 55):
    print("Your score is: D+")
elif (score >=50):
    print("Your score is: D")
elif (score <=49):
    print("Your score is: F")