import numpy as n
#Write a program to prompt for a score between 0.0 and 1.0. If the
#score is out of range, print an error message. If the score is between 0.0
#and 1.0, print a grade using the following table:
#>= 0.9 -> A         >= 0.8 -> B          >= 0.7 -> C           >= 0.6 ->  D     < 0.6 -> F

score=float(input("Enter the score between 0.0 and 1.0 "))

if score not in n.arange(0.0,1.1,0.0001):
    print(" Error ")

elif score >=0.9:
    print("A")
elif score >=0.8:
    print("B")

elif score >= 0.7:
    print("C")

elif score >= 0.6:
    print("D")

else:
    print("F")


