# Write your Python code here
class Studnet:

  def __init__(self, name, marks): 
    self.name = name
    self.marks = marks
    self.grade = ""

  def calculateGrade(self):
    if self.marks <40:
      self.grade = "D"
    elif self.marks < 60:
      self.grade = "C"
    elif self.marks < 80:
      self.grade = "B"
    else:
      self.grade = "A"

  def displayGrade(self):
     print(self.name)
     print("Grade - ")
     print(self.grade)


students = []

for i in range(3):
    name = input("Enter name: ")
    marks = int(input("Enter Marks: "))

    st = Studnet(name, marks)
    st.calculateGrade()
    students.append(st)

for i in range(3):
  studnet[i].displayGrade()