class Node:

  def __init__(self, data):

    self.data = data

    self.next = None

​

def traverseAndPrint(head):

  currentNode = head

  while currentNode:

    print(currentNode.data, end=" -> ")

    currentNode = currentNode.next

  print("null")

​

node1 = Node(7)

node2 = Node(11)

node3 = Node(3)

node4 = Node(2)

node5 = Node(9)

​

node1.next = node2

node2.next = node3

node3.next = node4

node4.next = node5

​

traverseAndPrint(node1)

​