class Student(object):
    def __init__(self,name,score):
        self.name=name
        self.score =score
    
    def get_grade(self):
        if self.score >= 90:
            return 'A'
        elif self.score >= 60:
            return 'B'
        else:
            return 'C'
    
lisa = Student('Lisa',99)
bart = Student('Bart', 59)
print(lisa.name, lisa.get_grade())
print(bart.name, bart.get_grade())

            