from __future__ import annotations

from collections.abc import Iterator
from typing import Any




class 			__magic_name__	:





   """simple docstring"""




   def __init__(						self       :	Tuple		,	_lowercase       :	Tuple				):



    """simple docstring"""



    _UpperCamelCase:  Any    						=			data
    _UpperCamelCase:  Node | None    						=			None




class 			__magic_name__	:





   """simple docstring"""




   def __init__(						self       :	Tuple				):



    """simple docstring"""



    _UpperCamelCase:  str    						=			None
    _UpperCamelCase:  Optional[int]    						=			None



   def __iter__(						self       :	Any				):



    """simple docstring"""



    _UpperCamelCase:  Union[str, Any]    						=			self.head
    while self.head:
     yield node.data
     _UpperCamelCase:  Tuple    						=			node.next
     if node == self.head:
      break



   def __len__(						self       :	Dict				):



    """simple docstring"""



    return sum(1 for _ in self				)



   def __repr__(						self       :	Union[str, Any]				):



    """simple docstring"""



    return "->".join(str(__UpperCAmelCase				) for item in iter(self				)				)



   def 	lowerCAmelCase    (						self       :	int		,	_lowercase       :	Union[str, Any]				):



    """simple docstring"""



    self.insert_nth(len(self				)		,	__UpperCAmelCase				)



   def 	lowerCAmelCase    (						self       :	Optional[int]		,	_lowercase       :	Dict				):



    """simple docstring"""



    self.insert_nth(0		,	__UpperCAmelCase				)



   def 	lowerCAmelCase    (						self       :	Any		,	_lowercase       :	Union[str, Any]		,	_lowercase       :	Any				):



    """simple docstring"""



    if index < 0 or index > len(self				):
     raise IndexError('''list index out of range.'''				)
    _UpperCamelCase:  Optional[Any]    						=			Node(__UpperCAmelCase				)
    if self.head is None:
     _UpperCamelCase:  int    						=			new_node  # first node points itself
     _UpperCamelCase:  int    						=			new_node
    elif index == 0:  # insert at head
     _UpperCamelCase:  str    						=			self.head
     _UpperCamelCase:  Any    						=			new_node
    else:
     _UpperCamelCase:  Union[str, Any]    						=			self.head
     for _ in range(index - 1				):
      _UpperCamelCase:  Optional[int]    						=			temp.next
     _UpperCamelCase:  List[str]    						=			temp.next
     _UpperCamelCase:  Optional[Any]    						=			new_node
     if index == len(self				) - 1:  # insert at tail
      _UpperCamelCase:  str    						=			new_node



   def 	lowerCAmelCase    (						self       :	Optional[int]				):



    """simple docstring"""



    return self.delete_nth(0				)



   def 	lowerCAmelCase    (						self       :	Any				):



    """simple docstring"""



    return self.delete_nth(len(self				) - 1				)



   def 	lowerCAmelCase    (						self       :	Dict		,	_lowercase       :	Optional[int] = 0				):



    """simple docstring"""



    if not 0 <= index < len(self				):
     raise IndexError('''list index out of range.'''				)
    _UpperCamelCase:  List[str]    						=			self.head
    if self.head == self.tail:  # just one node
     _UpperCamelCase:  Union[str, Any]    						=			None
    elif index == 0:  # delete head node
     _UpperCamelCase:  List[str]    						=			self.tail.next.next
     _UpperCamelCase:  Tuple    						=			self.head.next
    else:
     _UpperCamelCase:  Dict    						=			self.head
     for _ in range(index - 1				):
      _UpperCamelCase:  List[str]    						=			temp.next
     _UpperCamelCase:  Optional[int]    						=			temp.next
     _UpperCamelCase:  int    						=			temp.next.next
     if index == len(self				) - 1:  # delete at tail
      _UpperCamelCase:  Optional[Any]    						=			temp
    return delete_node.data



   def 	lowerCAmelCase    (						self       :	List[Any]				):



    """simple docstring"""



    return len(self				) == 0




def    lowerCAmelCase_  (		)     ->					None:







 '''simple docstring'''
 _UpperCamelCase:  int    						=			CircularLinkedList()
 assert len(_SCREAMING_SNAKE_CASE		) == 0
 assert circular_linked_list.is_empty() is True
 assert str(_SCREAMING_SNAKE_CASE		) == ""

 try:
  circular_linked_list.delete_front()
  raise AssertionError  # This should not happen
 except IndexError:
  assert True  # This should happen

 try:
  circular_linked_list.delete_tail()
  raise AssertionError  # This should not happen
 except IndexError:
  assert True  # This should happen

 try:
  circular_linked_list.delete_nth(-1		)
  raise AssertionError
 except IndexError:
  assert True

 try:
  circular_linked_list.delete_nth(0		)
  raise AssertionError
 except IndexError:
  assert True

 assert circular_linked_list.is_empty() is True
 for i in range(5		):
  assert len(_SCREAMING_SNAKE_CASE		) == i
  circular_linked_list.insert_nth(_SCREAMING_SNAKE_CASE	,       i + 1		)
 assert str(_SCREAMING_SNAKE_CASE		) == "->".join(str(_SCREAMING_SNAKE_CASE		) for i in range(1	,       6		)		)

 circular_linked_list.insert_tail(6		)
 assert str(_SCREAMING_SNAKE_CASE		) == "->".join(str(_SCREAMING_SNAKE_CASE		) for i in range(1	,       7		)		)
 circular_linked_list.insert_head(0		)
 assert str(_SCREAMING_SNAKE_CASE		) == "->".join(str(_SCREAMING_SNAKE_CASE		) for i in range(0	,       7		)		)

 assert circular_linked_list.delete_front() == 0
 assert circular_linked_list.delete_tail() == 6
 assert str(_SCREAMING_SNAKE_CASE		) == "->".join(str(_SCREAMING_SNAKE_CASE		) for i in range(1	,       6		)		)
 assert circular_linked_list.delete_nth(2		) == 3

 circular_linked_list.insert_nth(2	,       3		)
 assert str(_SCREAMING_SNAKE_CASE		) == "->".join(str(_SCREAMING_SNAKE_CASE		) for i in range(1	,       6		)		)

 assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
  import doctest

  doctest.testmod()






"""simple docstring"""





def 					__A  (_SCREAMING_SNAKE_CASE	,  _SCREAMING_SNAKE_CASE     )   ->list[str]:





  """simple docstring"""


  return [sentence[i : i + ngram_size] for i in range(len(_SCREAMING_SNAKE_CASE     ) - ngram_size + 1     )]


if __name__ == "__main__":
  from doctest import testmod

  testmod()
