using System;

​

namespace ClassesHierarchy

{

    class Person

    {

        public string name;

        public int age;

​

        public void SayHi()

        {

            Console.WriteLine("Hi, my name is {0} and I am {1} years old.", name, age);

        }

    }

​

    class Specialist : Person

    {

        public string speciality;

​

        public void NameSpeciality()

        {

            Console.WriteLine("And my speciality is {0}.", speciality);

        }

    }

    class Employee : Specialist

    {

        public string work; 

​

        public void SayYourWork()

        {

            Console.WriteLine("I work at {0}.", work);

        }

    }

​

    class Teacher : Employee

    {

        public string subject;

​

        public void NameSubject()

        {

            Console.WriteLine("I teach {0}.", subject);

        }

    }

​

    class ClassTeacher : Teacher

    {

        public string form;

​

        public void NameForm()

        {

            Console.WriteLine("I am a class teacher of the {0}.", form);

        }

    }

​

    class Program

    {

        public static void Main(string[]args)

        {

            ClassTeacher me = new ClassTeacher();

            me.name = "Ann Leonicheva";

            me.age = 24;

            me.speciality = "Teacher of English and Ukrainian languages";

            me.work = "School";

            me.subject = "English  and Ukrainian languages";

            me.form = "5 A";

            me.SayHi();

            me.NameSpeciality();

            me.SayYourWork();

            me.NameSubject();

            me.NameForm();

        }

    }

}

​