class Person:
    def __init__(self,first_name,last_name,age):
        self.__first_name = first_name
        self.__last_name = last_name
        self.__age = age
        self.__gmail = first_name + "." +  last_name + "@gmail.com"
    def __str__(self):
        return(self.fullname() + " is " + self.__age + " years old and her email id is " + self.__gmail)
    def fullname(self):
        return(self.__first_name + " " + self.__last_name)