using System;

​

public class Node

{

    public Node(string data)

    {

        Data = data;

        Mark = false;

    }

​

    public Node Next

    {

        get;

        set;

    }

​

    public string Data

    {

        get;

        set;

    }

​

    public bool Mark

    {

        get;

        set;

    }

}

​

public class Program

{

    public static void Main()

    {

    }

​

    public static void Test()

    {

        var headList1 = new Node("A");

        var headList2 = new Node("1");

        var interSection = new Node("Z");

    }

​

    public static void InsertTail(Node head, Node tail)

    {

        var current = head;

        while (current.Next != null)

        {

            current = current.Next;

        }

​

        current.Next = tail;

    }

}