using System;

​

public class StringTransformer {

    public string Subject {

        get;

        set;

    }

    public StringTransformer(string subject) {

        this.Subject = subject;

    }

    public virtual string Transform(string s) {

        return s;

    }

}

public class Program

{

    public static void Main()

    {

        StringTransformer basic = new StringTransformer("VR");

        Console.WriteLine("{0} would change {1} to {2}", basic.Subject, "cheese", basic.Transform("cheese"));

    }

}