using System;
 
public class Test
{
	public static void Main()
	{
		var c = new C();
    	c.MethodOne();
	}
}
 
public class A
{
    public virtual void MethodOne()
    {
       Console.WriteLine( "A" ); 
    }
}
 
public class B : A
{
    public override void MethodOne()
    {
        base.MethodOne();
        Console.WriteLine( "B" );
    }
}
 
public class C : B
{
    public override void MethodOne()
    {
        base.MethodOne();
        Console.WriteLine( "C" );
    }
}

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