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

def create_list(value):
    head = Node(value)
    head.next = head
    return head

def insert_tail(head, value):
    p = head
    while p.next != head:
        p = p.next
    node = Node(value)
    node.next = head
    p.next = node

def print_list(head):
    _______________________________
    while True:
        print(p.data, end=" ")
        p = p.next
        if p == head:
            break
    print()