using System;

public class Program

{

    public static void Main()

    {

        var cat1 = new Cat("Emi");        

        cat1.MakeSound();

        var dog1 = new Dog("Buddy");

        dog1.MakeSound();

    }

}

​

public abstract class Animal

{

    private string _name;    

    public string Name {get; set;}

    public Animal(string name)

    {

        Name = name;

    }

    public virtual void MakeSound()

    {

        Console.WriteLine($"{Name} is making sound...");

    }

}

​

public class Cat : Animal

{

    public Cat(string name) : base(name)

    {

    }

    public override void MakeSound()

    {

        Console.WriteLine($"{Name} says meow");

    }

}

​

public class Dog : Animal

{

    public Dog(string name) : base(name)

    {

    }

}