class Node:
    def __init__(self, value):
        self.value = value
        self.next = None


# Build the list 10 -> 20 -> 30 manually
head = Node(10)
head.next = Node(20)
head.next.next = Node(30)

print(head.value, head.next.value, head.next.next.value)  # 10 20 30