using System;

​

abstract class Base 

{

    protected int num;

    public Base(int n) {

        set(n);

    }

    public abstract void show();

    public abstract void set(int n);

    public abstract int get();

}

class Alpha : Base 

{

    protected int val;

    public Alpha(int n) : base(n) {

        show(); 

    }

    public override void show() {

        Console.WriteLine("Aplha: {0}, {1} и {2}", num, val, get());

    }

    public override void set(int n) {

        num = n;

        val = n%10;

    }

    public override int get() {

        return num/10;

    }

}

​

class Bravo : Base 

{

    protected int val;

    public Bravo(int n) : base(n) {

        show();

    }

    public override void show() {

        Console.WriteLine("Bravo: {0}, {1} и {2}", num, val, get());

    }

    public override void set (int n) {

        num = n;

        val = n%100;

    }

    public override int get() {

        return num/100;

    }

}

public class Program

{

    public static void Main()

    {

        Base obj;

        Alpha a = new Alpha(123);

        Bravo b = new Bravo(321);

        obj = a;

        Console.WriteLine("После выполнения obj = a");

        obj.set(456);

        obj.show();

        obj = b;

        Console.WriteLine("После выполнения obj = b");

        obj.set(654);

        obj.show();

​

    }

}