using System;

public class Program

{

    public static void Main()

    {

        Person p = new Person();

        Student s = new Student("Ayushi", 16, 109098);

        Student s1 = new Student("Vidhu", 17, 1090561);

        Teacher t = new Teacher("Salas", 26, "Pre-Calc");

        Person [] list = {p, s, s1, t};

        for(int i = 0; i < list.Length; i++)

        {

            list[i].DisplayDetails();

        }

    }

}

public class Person

{

    string Name;

    int Age;

    public Person()

    {

        Name = "Hanny";

        Age = 16;

    }

    public Person(string n, int a)

    {

        Name = n;

        Age = a;

    }

    public virtual void DisplayDetails()

    {

        Console.WriteLine("The person's name is " + Name + " and is " + Age + " years old");

    }

}

public class Student : Person

{

    int StudentId;

    public Student(string n, int a, int s) : base(n, a)

    {

        StudentId = s;

    }

    public override void DisplayDetails()

    {

        Console.WriteLine("The student's ID is " + StudentId);

    }

}

public class Teacher : Person

{

    string Subject;

    public Teacher(string n, int a, string s) : base(n, a)

    {

        Subject = s;

    }

    public override void DisplayDetails()

    {

        Console.WriteLine("The teacher teaches " + Subject);

    }

}