using System;
using System.Data;

public abstract class Animal
{
    public abstract void ShowType();

    public void Eat() 
    {
        Console.WriteLine("Animal always eat.");
    }
}

public class Bird : Animal
{
    private string type = "Bird";

    public override void ShowType()
    {
        Console.WriteLine("Type is {0}", type);
    }

    private string color;

    public string Color
    {
        get { return color; }
        set { color = value; }
    }
}

public class Chicken : Bird
{
    private string type = "Chicken";
    
    public override void ShowType()
    {
        Console.WriteLine("Type is {0}", type);
    }
    
    public void ShowColor()
    {
        Console.WriteLine("Color is {0}", Color);
    }
}

public class TestInheritance
{
    public static void Main()
    {
        Bird bird2 = new Chicken();
        bird2.ShowType();
    }
}