

"""simple docstring"""






from __future__ import annotations

from typing import Any






class     _UpperCAmelCase			:
			def __init__(		self      ,		_A      ,		_A     )    ->    None:  # noqa: A002






				'''simple docstring'''







				_UpperCAmelCase    :							str									=					item
				_UpperCAmelCase    :							List[str]									=					next






class     _UpperCAmelCase			:
			def __init__(		self     )    ->    None:






				'''simple docstring'''







				_UpperCAmelCase    :							Node | None									=					None
				_UpperCAmelCase    :							int									=					0
			def 							__snake_case (		self      ,		_A     )    ->    None:






				'''simple docstring'''







				_UpperCAmelCase    :							List[Any]									=					Node(_A      ,		self.head     )
				self.size += 1
			def 							__snake_case (		self     )    ->    Any:






				'''simple docstring'''







				if self.head is None:
					return None
				else:
					_UpperCAmelCase    :							List[str]									=					self.head.item
					_UpperCAmelCase    :							Dict									=					self.head.next
					self.size -= 1
					return item
			def 							__snake_case (		self     )    ->    bool:






				'''simple docstring'''







				return self.head is None
			def __str__(		self     )    ->    str:






				'''simple docstring'''







				if self.is_empty():
					return ""
				else:
					_UpperCAmelCase    :							Union[str, Any]									=					self.head
					_UpperCAmelCase    :							List[str]									=					""""""
					_UpperCAmelCase    :							list[str]									=					[]
					while iterate:
						item_list.append(str(iterate.item     )     )
						_UpperCAmelCase    :							Optional[Any]									=					iterate.next

					_UpperCAmelCase    :							Tuple									=					""" --> """.join(_A     )

					return item_str
			def __len__(		self     )    ->    int:






				'''simple docstring'''







				return self.size








"""simple docstring"""






import safs






class     _UpperCAmelCase			(		safs.SaFileSystem):
			pass





