


'''simple docstring'''







class  lowerCAmelCase_						:





  """simple docstring"""



  def __init__(					self     :							int				,							SCREAMING_SNAKE_CASE__     :							int				,							SCREAMING_SNAKE_CASE__     :							Any=None				,							SCREAMING_SNAKE_CASE__     :							Any=None						):





       '''simple docstring'''

       __a       =   data
       __a       =   previous
       __a       =   next_node

  def __str__(					self     :							List[Any]						):





       '''simple docstring'''

       return f'''{self.data}'''

  def __a						(					self     :							Any						):





       '''simple docstring'''

       return self.data

  def __a						(					self     :							str						):





       '''simple docstring'''

       return self.next


  def __a						(					self     :							str						):





       '''simple docstring'''

       return self.previous


class  lowerCAmelCase_						:





  """simple docstring"""



  def __init__(					self     :							Tuple				,							SCREAMING_SNAKE_CASE__     :							List[str]						):





       '''simple docstring'''

       __a       =   head

  def __iter__(					self     :							int						):





       '''simple docstring'''

       return self


  def __a						(					self     :							Tuple						):





       '''simple docstring'''

       if not self.current:
            raise StopIteration
       else:
            __a       =   self.current.get_data()
            __a       =   self.current.get_next()
            return value


class  lowerCAmelCase_						:





  """simple docstring"""



  def __init__(					self     :							Optional[int]						):





       '''simple docstring'''

       __a       =   None  # First node in list
       __a       =   None  # Last node in list

  def __str__(					self     :							Any						):





       '''simple docstring'''

       __a       =   self.head
       __a       =   []
       while current is not None:
            nodes.append(current.get_data()						)
            __a       =   current.get_next()
       return " ".join(str(SCREAMING_SNAKE_CASE__						) for node in nodes						)

  def __contains__(					self     :							List[str]				,							SCREAMING_SNAKE_CASE__     :							int						):





       '''simple docstring'''

       __a       =   self.head
       while current:
            if current.get_data() == value:
                 return True
            __a       =   current.get_next()
       return False

  def __iter__(					self     :							Tuple						):





       '''simple docstring'''

       return LinkedListIterator(self.head						)

  def __a						(					self     :							Any						):





       '''simple docstring'''

       if self.head:
            return self.head.get_data()
       return None

  def __a						(					self     :							Any						):





       '''simple docstring'''

       if self.tail:
            return self.tail.get_data()
       return None

  def __a						(					self     :							List[Any]				,							SCREAMING_SNAKE_CASE__     :							Node						):





       '''simple docstring'''

       if self.head is None:
            __a       =   node
            __a       =   node
       else:
            self.insert_before_node(self.head				,							SCREAMING_SNAKE_CASE__						)

  def __a						(					self     :							Optional[int]				,							SCREAMING_SNAKE_CASE__     :							Node						):





       '''simple docstring'''

       if self.head is None:
            self.set_head(SCREAMING_SNAKE_CASE__						)
       else:
            self.insert_after_node(self.tail				,							SCREAMING_SNAKE_CASE__						)

  def __a						(					self     :							Tuple				,							SCREAMING_SNAKE_CASE__     :							int						):





       '''simple docstring'''

       __a       =   Node(SCREAMING_SNAKE_CASE__						)
       if self.head is None:
            self.set_head(SCREAMING_SNAKE_CASE__						)
       else:
            self.set_tail(SCREAMING_SNAKE_CASE__						)

  def __a						(					self     :							Dict				,							SCREAMING_SNAKE_CASE__     :							Node				,							SCREAMING_SNAKE_CASE__     :							Node						):





       '''simple docstring'''

       __a       =   node
       __a       =   node.previous

       if node.get_previous() is None:
            __a       =   node_to_insert
       else:
            __a       =   node_to_insert

       __a       =   node_to_insert

  def __a						(					self     :							Optional[Any]				,							SCREAMING_SNAKE_CASE__     :							Node				,							SCREAMING_SNAKE_CASE__     :							Node						):





       '''simple docstring'''

       __a       =   node
       __a       =   node.next

       if node.get_next() is None:
            __a       =   node_to_insert
       else:
            __a       =   node_to_insert

       __a       =   node_to_insert

  def __a						(					self     :							Optional[int]				,							SCREAMING_SNAKE_CASE__     :							int				,							SCREAMING_SNAKE_CASE__     :							int						):





       '''simple docstring'''

       __a       =   1
       __a       =   Node(SCREAMING_SNAKE_CASE__						)
       __a       =   self.head
       while node:
            if current_position == position:
                 self.insert_before_node(SCREAMING_SNAKE_CASE__				,							SCREAMING_SNAKE_CASE__						)
                 return
            current_position += 1
            __a       =   node.next
       self.insert_after_node(self.tail				,							SCREAMING_SNAKE_CASE__						)

  def __a						(					self     :							Union[str, Any]				,							SCREAMING_SNAKE_CASE__     :							int						):





       '''simple docstring'''

       __a       =   self.head
       while node:
            if node.get_data() == item:
                 return node
            __a       =   node.get_next()
       raise Exception("""Node not found"""						)

  def __a						(					self     :							Optional[int]				,							SCREAMING_SNAKE_CASE__     :							int						):





       '''simple docstring'''

       if (node := self.get_node(SCREAMING_SNAKE_CASE__						)) is not None:
            if node == self.head:
                 __a       =   self.head.get_next()

            if node == self.tail:
                 __a       =   self.tail.get_previous()

            self.remove_node_pointers(SCREAMING_SNAKE_CASE__						)

  @staticmethod
  def __a						(					SCREAMING_SNAKE_CASE__     :							Node						):





       '''simple docstring'''

       if node.get_next():
            __a       =   node.previous

       if node.get_previous():
            __a       =   node.next

       __a       =   None
       __a       =   None


  def __a						(					self     :							Optional[Any]						):





       '''simple docstring'''

       return self.head is None




def        __lowercase						(      )				->					None:
     """simple docstring"""






if __name__ == "__main__":
 import doctest

 doctest.testmod()










'''simple docstring'''







def        __lowercase						(      __SCREAMING_SNAKE_CASE		)				->					str:
     """simple docstring"""




     return " ".join(input_str.split()[::-1]		)


if __name__ == "__main__":
 import doctest

 doctest.testmod()






