using System;

public class Program

{

    public static void Main()

    {

        car myCar = new car();

        myCar.sound();

        student dave = new student();

        dave.thing();

        dave.yes();

        dave.age = 1;

        Console.WriteLine(dave.age);

    }

}

​

public class vehicle

{

public string brand = "ford";   

    public void sound() 

    {

        Console.WriteLine("meep meep"); 

    }

}

​

​

public class car: vehicle

{

    public string model = "mustang";    

}   

​

public class individual

{

    public int age; 

    public void thing()

    {

        Console.WriteLine("mmmmmmmmmmmm");  

    }   

}

​

public class student: individual

{

​

    public void yes()

    {

        Console.WriteLine("no");

    }

}

​