using System;

public class Program

{

    public static void Main()

    {

        ListNode list1 = new ListNode(1, null);

        list1.next = new ListNode(2,null);

        list1.next.next = new ListNode(4,null);

​

        ListNode list2 = new ListNode(1, null);

        ListNode nextT = list2;

        nextT = nextT.next;

        nextT = new ListNode(3,null);

        list2.next = nextT;

        nextT = nextT.next;

        nextT = new ListNode(4,null);

        list2.next = nextT;

        // list2.next = new ListNode(3,null);

        // list2.next.next = new ListNode(4,null);

​

        ListNode node1 = list1;

        ListNode node2 = list2;

        Console.WriteLine("\nresult: ");

        var temp = list2;

        while(temp!=null){

            Console.WriteLine(temp.val);

            temp = temp.next;

        }

​

    }

     public class ListNode {

     public int val;

     public ListNode next;

     public ListNode(int val=0, ListNode next=null) {

         this.val = val;

         this.next = next;

      }

  }

}