class Person:
    domain_name=None
    counter=0
    def __init__(self,first_name,last_name,age):
		#Fill your code 
        self.__first_name=first_name
        self.__last_name=last_name
        self.__age=age
        self.__email='{}.{}@{}'.format(self.__first_name,self.__last_name,self.domain_name)
        Person.counter +=1
    def __str__(self):
		#Fill your code
        return '{} {} is {} years old and her email id is {}'.format(self.__first_name,self.__last_name,self.__age,self.__email)
	
    @property
    def age(self):
        return self.__age
    
    @age.setter
    def age(self,value):
        self.__age=value
        
    def fullname(self):
		#Fill your code
        return self.__first_name+' '+self.__last_name