class Person(object):

    def __init__(self, name, score):
        self.name = name
        self.__score = score

    def get_grade(self):
        if self.__score >= 80:
            print 'A'
        elif self.__socre >= 60:
            print 'B'
        else:
            print 'C'

p1 = Person('Bob', 90)
p2 = Person('Alice', 65)
p3 = Person('Tim', 48)

print p1.get_grade()
print p2.get_grade()
print p3.get_grade()