static void Main(string[] args)
        {
            Console.WriteLine(args);
            Array.ForEach(args, Console.WriteLine);

            var myDetail = new Person()
            {
                FirstName = "John",
                LastName  = "Doe"
            };

            myDetail.MeetPerson();

            var studentDetail = new Student()
            {
                FirstName = myDetail.FirstName,
                LastName  = myDetail.LastName
            };

            studentDetail.MeetPerson();
            studentDetail.SetAge(21);
            studentDetail.ShowAge();
            studentDetail.GoToClasses();

            var myTeacher = new Teacher()
            {
                FirstName = "Paul",
                LastName  = "Bulton",
                student   = studentDetail
            };

            myTeacher.SetAge(30);
            myTeacher.MeetPerson();
            myTeacher.Explain("Maths");

            Console.ReadLine();
        }