# Write your Python code here
#input

gradeList = []

for i in range(3):
    marks = input("Enter your marks\n")
    print(marks)

    marksInt = int(marks)

    grade = ''

    if marksInt < 40:
        grade = 'D'
    elif marksInt < 60:
        grade = 'C'
    elif marksInt < 80:
        grade = 'B'
    else:
        grade = 'A'

    print("your grade is ")
    print(grade)
    gradeList.append(grade)

print(gradeList)