# Write your Python code here
# input
gradeList = []
for i in range(4):
  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[A],[D],[C])
print(gradeList.append)