using System;

public class Program

{

    public static void Main()

    {

        //Person somePerson=new Person("Jim", 16);

        Student someStudent=new Student("Rebecca",15,123456);

        Teacher someTeacher=new Teacher("Simmons","Physics",26);

        Person[] people={/*somePerson,*/someStudent,someTeacher};

        foreach(Person p in people){

            p.DisplayDetails();

        }

    }

    public abstract class Person{

        protected string Name{get;set;}

        protected int Age{get;set;}

        public Person(){}

        public Person(string n, int a){Name=n;Age=a;}

        public abstract void DisplayDetails();/*{Console.WriteLine("This Person's name is {0} and they are {1} years old.",Name,Age);}*/

    }

    public class Student : Person{

        protected int StudentID{get;set;}

        public Student():base(){}

        public Student(string n, int a, int id) : base(n,a){StudentID=id;}

        public override void DisplayDetails(){Console.WriteLine("This Student's ID is {0}, their name is {1}, and they are {2} years old",StudentID,Name,Age);}

    }

    public class Teacher : Person{

        protected string Subject{get;set;}

        public Teacher():base(){}

        public Teacher(string n, string s, int a):base(n,a){Subject=s;}

        public override void DisplayDetails(){Console.WriteLine("This Teacher's name is {0}, they are {1} years old and they teach {2}",Name,Age,Subject);}

    }

}