using System;

public class Node<T>

{

    private T value;

    private Node<T> next;

    public Node(T value)

    {

        this.value = value;

        next = null;

    }

​

    public Node(T value, Node<T> next)

    {

        this.value = value;

        this.next = next;

    }

​

    public T GetValue()

    {

        return value;

    }

​

    public Node<T> GetNext()

    {

        return next;

    }

​

    public void SetValue(T value)

    {

        this.value = value;

    }

​

    public void SetNext(Node<T> next)

    {

        this.next = next;

    }

​

    public override string ToString()

    {

        return value.ToString();

    }

}           

public class Program

{

    public static Node<int> Pair(Node<int> n)

    {

        Node<int> head=null, pos=null;

        while(n!=null)

        {

            if(n.GetValue()%2==0)

            {

                if(head==null)

                {

                    head=new Node<int>(n.GetValue());

                    pos=head;

                }

                else

                {

                    pos.SetValue(n.GetValue());

                    pos=pos.GetNext();

                }

            }

            n=n.GetNext();

        }

        return head;

    }

    public static void Main()

    {

        Node<int> n=new Node<int>(5,new Node<int>(6,new Node<int>(8)));

        Node<int> n1=Pair(n);

    }

}