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):
        a=person_str.split(",")
        return cls(a[0],a[1])
    @staticmethod
    def initialize_counter(value):
        Person.counter = value 
    def __str__(self):
        return self.__name + " is " + self.__age + " years old and her id is "+str(self.__id);