grade

grades ={"A+": 4.2, "A": 4.0, "A-": 3.9, "B+": 3.7,"B": 3.2, "B-": 3.0, "C+": 2.8,"C": 2.2, "C-": 2.0, "D+": 1.8,"D":1.2,"F":0}

check = True
total_count = 0
total_point = 0
while check:
    check2 = True
    count = 0
    point = 0
    while check2:
        letter = input("Please enter the grade: ")
        if letter == "quit":
            check = False
            break
        if letter == "":
            break
        if letter in grades:
            point += grades[letter]
            count += 1
        else:
            print("Invalid Grade!!!")
    if point != 0:
        gpa = point/count
        print(f'The GPA is {gpa}')
    elif point == 0:
        print("No GPA calculated")
    total_count += count
    total_point += point

if total_point != 0:
    overall_avg = total_point/total_count
    print(f'The Overall average is {round(overall_avg,3)}')
else:
    print("No Overall average calculated")