class ListNode:
    def __init__(self,data,next):
        self.data = data
        self.next = next

    def __repr__(self):
        return str(self.data)

class MyCircularLinkedList:
    def __init__(self):
        self.tail = None

    def __repr__(self):
        s = ''
        current = self.tail
        if current != None:
            s = s + str(current)
            current = current.next
        while current != self.tail:
            s = s + " -> " + str(current)
            current = current.next
        if not s: # s == '':
            s = 'empty list'
        return s

    def append(self,e):
        if not self.tail: # self.head == None:
            self.tail = ListNode(e,None)
            self.tail.next = self.tail
        else:
            n = ListNode(e,None)

            n.next = self.tail.next
            self.tail.next = n
            self.tail = n

    def delete(self,e):
        if self.tail:
            if self.tail.next == self.tail:
                self.tail = None
            else :
                n = self.tail
                while n.next.data != e:
                    n = n.next
                    if n.next == self.tail:
                        self.tail = n.next.next
                n.next = n.next.next


mylist =  MyCircularLinkedList()
print(mylist)
mylist.append(1)
print(mylist)
mylist.append(2)
print(mylist)
mylist.append(3)
print(mylist)
mylist.delete(2)
print(mylist)
mylist.delete(1)
print(mylist)
mylist.delete(3)
print(mylist)