class Person:
    counter = 0
    def __init__(self,name, age):
        self.__name = name
        self.__age = age
        Person.counter = (int) (Person.counter) + 1
        self.__id = Person.counter
    @classmethod
    def from_string(cls, person_str):
        l=person_str.split(",")
        cls.__name=l[0]
        cls.__age=int(l[1])
        p=Person(cls.__name,cls.__age)
        return(p)
    def initialize_counter(value):
        Person.counter=value
    def __str__(self):
        return("%s is %s years old and her id is %s" %(self.__name,self.__age,self.__id))