"""simple docstring"""





class  _snake_case     :






						def __init__(       self      :			List[Any]							,					UpperCAmelCase      :			int							,					UpperCAmelCase      :			List[Any]=None							,					UpperCAmelCase      :			List[Any]=None    ):
													__lowerCamelCase					:		Tuple		   =     data
													__lowerCamelCase					:		Optional[int]		   =     previous
													__lowerCamelCase					:		Tuple		   =     next_node






						def __str__(       self      :			Any    ):
													return F"""{self.data}"""






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






						def       lowerCamelCase__     (       self      :			List[Any]    ):
													return self.next







						def       lowerCamelCase__     (       self      :			Any    ):
													return self.previous

class  _snake_case     :






						def __init__(       self      :			Optional[Any]							,					UpperCAmelCase      :			List[Any]    ):
													__lowerCamelCase					:		Dict		   =     head






						def __iter__(       self      :			List[Any]    ):
													return self







						def       lowerCamelCase__     (       self      :			Tuple    ):
													if not self.current:
																				raise StopIteration
													else:
																				__lowerCamelCase					:		Dict		   =     self.current.get_data()
																				__lowerCamelCase					:		Any		   =     self.current.get_next()
																				return value

class  _snake_case     :






						def __init__(       self      :			List[Any]    ):
													__lowerCamelCase					:		Any		   =     None  # First node in list
													__lowerCamelCase					:		List[str]		   =     None  # Last node in list






						def __str__(       self      :			Optional[Any]    ):
													__lowerCamelCase					:		List[str]		   =     self.head
													__lowerCamelCase					:		Optional[int]		   =     []
													while current is not None:
																				nodes.append(current.get_data()    )
																				__lowerCamelCase					:		Union[str, Any]		   =     current.get_next()
													return " ".join(str(UpperCAmelCase    ) for node in nodes    )






						def __contains__(       self      :			Any							,					UpperCAmelCase      :			int    ):
													__lowerCamelCase					:		str		   =     self.head
													while current:
																				if current.get_data() == value:
																											return True
																				__lowerCamelCase					:		Tuple		   =     current.get_next()
													return False






						def __iter__(       self      :			Any    ):
													return LinkedListIterator(self.head    )






						def       lowerCamelCase__     (       self      :			Optional[Any]    ):
													if self.head:
																				return self.head.get_data()
													return None






						def       lowerCamelCase__     (       self      :			int    ):
													if self.tail:
																				return self.tail.get_data()
													return None






						def       lowerCamelCase__     (       self      :			Tuple							,					UpperCAmelCase      :			Node    ):
													if self.head is None:
																				__lowerCamelCase					:		Dict		   =     node
																				__lowerCamelCase					:		List[Any]		   =     node
													else:
																				self.insert_before_node(self.head							,					UpperCAmelCase    )






						def       lowerCamelCase__     (       self      :			List[str]							,					UpperCAmelCase      :			Node    ):
													if self.head is None:
																				self.set_head(UpperCAmelCase    )
													else:
																				self.insert_after_node(self.tail							,					UpperCAmelCase    )






						def       lowerCamelCase__     (       self      :			List[str]							,					UpperCAmelCase      :			int    ):
													__lowerCamelCase					:		str		   =     Node(UpperCAmelCase    )
													if self.head is None:
																				self.set_head(UpperCAmelCase    )
													else:
																				self.set_tail(UpperCAmelCase    )






						def       lowerCamelCase__     (       self      :			Dict							,					UpperCAmelCase      :			Node							,					UpperCAmelCase      :			Node    ):
													__lowerCamelCase					:		str		   =     node
													__lowerCamelCase					:		str		   =     node.previous

													if node.get_previous() is None:
																				__lowerCamelCase					:		Optional[int]		   =     node_to_insert
													else:
																				__lowerCamelCase					:		List[str]		   =     node_to_insert

													__lowerCamelCase					:		str		   =     node_to_insert






						def       lowerCamelCase__     (       self      :			Optional[int]							,					UpperCAmelCase      :			Node							,					UpperCAmelCase      :			Node    ):
													__lowerCamelCase					:		List[str]		   =     node
													__lowerCamelCase					:		Union[str, Any]		   =     node.next

													if node.get_next() is None:
																				__lowerCamelCase					:		Any		   =     node_to_insert
													else:
																				__lowerCamelCase					:		Union[str, Any]		   =     node_to_insert

													__lowerCamelCase					:		Tuple		   =     node_to_insert






						def       lowerCamelCase__     (       self      :			List[Any]							,					UpperCAmelCase      :			int							,					UpperCAmelCase      :			int    ):
													__lowerCamelCase					:		Optional[Any]		   =     1
													__lowerCamelCase					:		Any		   =     Node(UpperCAmelCase    )
													__lowerCamelCase					:		List[Any]		   =     self.head
													while node:
																				if current_position == position:
																											self.insert_before_node(UpperCAmelCase							,					UpperCAmelCase    )
																											return
																				current_position += 1
																				__lowerCamelCase					:		Optional[int]		   =     node.next
													self.insert_after_node(self.tail							,					UpperCAmelCase    )






						def       lowerCamelCase__     (       self      :			Optional[int]							,					UpperCAmelCase      :			int    ):
													__lowerCamelCase					:		List[str]		   =     self.head
													while node:
																				if node.get_data() == item:
																											return node
																				__lowerCamelCase					:		Optional[Any]		   =     node.get_next()
													raise Exception("Node not found"    )






						def       lowerCamelCase__     (       self      :			Any							,					UpperCAmelCase      :			List[str]    ):
													if (node := self.get_node(UpperCAmelCase    )) is not None:
																				if node == self.head:
																											__lowerCamelCase					:		Any		   =     self.head.get_next()

																				if node == self.tail:
																											__lowerCamelCase					:		Dict		   =     self.tail.get_previous()

																				self.remove_node_pointers(UpperCAmelCase    )






						@staticmethod
						def       lowerCamelCase__     (       UpperCAmelCase      :			Node    ):
													if node.get_next():
																				__lowerCamelCase					:		Any		   =     node.previous

													if node.get_previous():
																				__lowerCamelCase					:		Tuple		   =     node.next

													__lowerCamelCase					:		List[str]		   =     None
													__lowerCamelCase					:		List[Any]		   =     None







						def       lowerCamelCase__     (       self      :			List[Any]    ):
													return self.head is None


def    lowercase_   (   ) ->      None:



							'''simple docstring'''



if __name__ == "__main__":
				import doctest

				doctest.testmod()
"""simple docstring"""





import copy
from dataclasses import dataclass
from pathlib import Path
from typing import Dict, Optional, Union
@dataclass
class  _snake_case     :
						snake_case__			  =			None
						snake_case__			  =			False
						snake_case__			  =			False
						snake_case__			  =			False
						snake_case__			  =			None
						snake_case__			  =			None
						snake_case__			  =			False
						snake_case__			  =			False
						snake_case__			  =			False
						snake_case__			  =			True
						snake_case__			  =			None
						snake_case__			  =			1
						snake_case__			  =			None
						snake_case__			  =			False
						snake_case__			  =			None
						snake_case__			  =			None






						def       lowerCamelCase__     (       self      :			Any    ):
													return self.__class__(**{k: copy.deepcopy(UpperCAmelCase    ) for k, v in self.__dict__.items()}    )