# Write your Python code here
class School:
  def __init__(self):
    self.students = []

  def findTopper(self):
    # add logic to find student with highest marks
    topper = self.students[0]
    return topper

  def addStudent(self, student):
    self.students.append(student)
  
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.name)
    print("Grade - ")
    print(self.grade)

school1= School()

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

    st = Student(name, marks)
    st.calculateGrade()
    school1.addStudent(st)

topper = school1.findTopper()
print("Topper is -")
print(topper.name)