# Write your Python code here
#print("Hello, Excelrs!")
class student:
 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.grade)

st1 = student("st1",89)


st1.calculategrade()
st1.displaygrade()