using System;

class Node
{
    public int data;
    public Node next;
    public Node(int x)
    {
        data = x;
        next = null;
    }
}

class MainClass
{
    public static void PrintList(Node head)
    {
        Node curr = head;
        while (curr != null)
        {
            Console.Write(curr.data + " ");
            curr = curr.next;
        }
    }

    public static void Main()
    {
        Node head = new Node(10);
        head.next = new Node(20);
        head.next.next = new Node(30);
        head.next.next.next = new Node(40);
        PrintList(head);
    }
}
