"""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. """

score = input("Enter Score: ")
try:
    fs = float(score)
    
except:
    print("Error! Please enter numeric input")
    quit()

if fs > 1.0:
    print("Error! Enter a score between 0.0 - 1.1")
    quit()
elif fs < 0.0:
    print("Error! Enter a score between 0.0 - 1.1")
    quit()

elif fs >= 0.9:
    print("A")
elif fs >= 0.8:
    print("B")
elif fs >= 0.7:
    print("C")
elif fs >= 0.6:
    print("D")
elif fs < 0.6:
    print("F")