

from __future__ import annotations

from collections.abc import Iterator
from typing import Any






class _UpperCamelCase							:
			'''simple docstring'''







			def __init__(     self							:	List[Any] , a							:	str		)							->    Union[str, Any]:

				"""simple docstring"""

				SCREAMING_SNAKE_CASE				: Any			       =    data
				SCREAMING_SNAKE_CASE				: Node | None			       =    None






			def __str__(     self							:	Optional[Any]		)							->    Optional[int]:

				"""simple docstring"""

				return F"{self.data}"






class _UpperCamelCase							:
			'''simple docstring'''







			def __init__(     self							:	Tuple		)							->    int:

				"""simple docstring"""

				SCREAMING_SNAKE_CASE				: Node | None			       =    None
				SCREAMING_SNAKE_CASE				: Node | None			       =    None
			def __iter__(     self							:	Dict		)							->    Tuple:

				"""simple docstring"""

				SCREAMING_SNAKE_CASE				: Optional[int]			       =    self.front
				while node:
					yield node.data
					SCREAMING_SNAKE_CASE				: List[Any]			       =    node.next
			def __len__(     self							:	Optional[Any]		)							->    Any:

				"""simple docstring"""

				return len(tuple(iter(self		)		)		)
			def __str__(     self							:	str		)							->    Tuple:

				"""simple docstring"""

				return " <- ".join(str(lowercase__		) for item in self		)
			def 							__UpperCamelCase	(     self							:	Dict		)							->    Optional[int]:

				"""simple docstring"""

				return len(self		) == 0
			def 							__UpperCamelCase	(     self							:	Any , a							:	int		)							->    Optional[Any]:

				"""simple docstring"""

				SCREAMING_SNAKE_CASE				: Optional[int]			       =    Node(lowercase__		)
				if self.is_empty():
					SCREAMING_SNAKE_CASE				: Tuple			       =    node
				else:
					assert isinstance(self.rear , lowercase__		)
					SCREAMING_SNAKE_CASE				: List[str]			       =    node
					SCREAMING_SNAKE_CASE				: int			       =    node
			def 							__UpperCamelCase	(     self							:	Any		)							->    Optional[int]:

				"""simple docstring"""

				if self.is_empty():
					raise IndexError("dequeue from empty queue"		)
				assert isinstance(self.front , lowercase__		)
				SCREAMING_SNAKE_CASE				: Union[str, Any]			       =    self.front
				SCREAMING_SNAKE_CASE				: str			       =    self.front.next
				if self.front is None:
					SCREAMING_SNAKE_CASE				: Any			       =    None
				return node.data






			def 							__UpperCamelCase	(     self							:	str		)							->    List[Any]:

				"""simple docstring"""

				SCREAMING_SNAKE_CASE				: str			       =    None


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

				testmod()


import re

def 	lowerCamelCase__	(   _a):
	def docstring_decorator(_a):
		SCREAMING_SNAKE_CASE				: List[Any]			       =    fn.__doc__
		SCREAMING_SNAKE_CASE				: List[str]			       =    func_doc.split("\n")
		SCREAMING_SNAKE_CASE				: Dict			       =    0
		while i < len(_a) and re.search(r"^\s*Examples?:\s*$"							,     lines[i]) is None:
			i += 1
		if i < len(_a):
			SCREAMING_SNAKE_CASE				: Tuple			       =    example_docstring
			SCREAMING_SNAKE_CASE				: List[Any]			       =    "\n".join(_a)
		else:
			raise ValueError(
			    f"The function {fn} should have an empty 'Examples:' in its docstring as placeholder, "
			    f"current docstring is:\n{func_doc}")
		SCREAMING_SNAKE_CASE				: Optional[int]			       =    func_doc
		return fn

	return docstring_decorator