using System;

​

class Node

{

    private int Value;

    private Node Next;

    public Node(int Value)

    {

        this.Value = Value;

        this.Next = null;

    }

    public bool HasNext()

    {

            return (this.Next != null);

    }

    public int GetValue()

    {

        return this.Value;

    }

    public Node GetNext() 

    {

            return Next;

    }

     public void setNext(Node next) 

     {

         this.Next = next;

     }

}

public class Program

{

    public static void Main()

    {

    }

    static Node RemoveDuplicate (Node Head)

    {

        int n;

        Node p1 = Head;

        Node p2 = Head;

        while(p1 != null)

        {

            n = p1.GetValue();

            while(p2.HasNext())

            {

                if(p2.GetNext().GetValue()==n)

                {

                    p2.setNext(p2.GetNext().GetNext());

                }

                else

                {

                    p2 = p2.GetNext();

                }

            }

        }

        return Head;

    }

}