#Jonathan Hudson
#Student Number 12347890
#Date: 2020-08-26
#Lecture Practice

# Takes a letter grade of A+, A, A- and returns the GPA values 4.3, 4, 3.7
#       other input results in None returned
#
# Parameters:
#       grade: String letter grade {"A+","A","A-"} for non-None result
# Return:
#       Float GPA value of grade parameter
#       "A+" -> 4.3
#       "A" -> 4.0
#       "A-" -> 3.7
#       otherwise -> None
def getGPA(grade):
        if grade == "A+":
                return 4.3
        elif grade == "A":
                return 4
        elif grade == "A-":
                return 3.7
        else:
                return None

print(getGPA(input("Please enter the grade: ")))