class Person:
    domain_main=''
    counter=0
    def __init__(self,first_name,last_name,age):
        self.__first_name=first_name
        self.__last_name=last_name
        self.__age=age
        Person.counter+=1
    def __str__(self):
        return(self.__first_name+' '+self.__last_name+' is '+self.__age+' years old and her email id is '+self.__first_name+'.'+self.__last_name+"@"+self.domain_name)
    def fullname(self):
        return(self.__first_name+' '+self.__last_name)
    @property
    def age(self):
        return(self.__age)
        
    @age.setter
    def age(self,value):
        self.__age=value