from __future__ import annotations

from typing import Generic, TypeVar

lowerCamelCase_				:		Dict       						=       TypeVar("""T""")


class 						a__							(   Generic[T]		):



			def __init__(						self      ,						UpperCAmelCase    ) ->    List[str]:
								__a							=   data  # Assign data
								__a							=   None  # Initialize next as null
								__a							=   None  # Initialize prev as null






class 						a__							(   Generic[T]		):



			def __init__(						self    ) ->    None:
								__a							=   None



			def __SCREAMING_SNAKE_CASE							(						self      ,						UpperCAmelCase    ) ->    None:
								if self.head is None:
													__a							=   Node(UpperCAmelCase    )
								else:
													__a							=   Node(UpperCAmelCase    )
													__a							=   new_node
													__a							=   self.head
													__a							=   None
													__a							=   new_node



			def __SCREAMING_SNAKE_CASE							(						self    ) ->    T | None:
								if self.head is None:
													return None
								else:
													assert self.head is not None
													__a							=   self.head.data
													__a							=   self.head.next
													if self.head is not None:
																		__a							=   None
													return temp



			def __SCREAMING_SNAKE_CASE							(						self    ) ->    T | None:
								return self.head.data if self.head is not None else None



			def __len__(						self    ) ->    int:
								__a							=   self.head
								__a							=   0
								while temp is not None:
													count += 1
													__a							=   temp.next
								return count



			def __SCREAMING_SNAKE_CASE							(						self    ) ->    bool:
								return self.head is None







			def __SCREAMING_SNAKE_CASE							(						self    ) ->    None:
								print('stack elements are:'    )
								__a							=   self.head
								while temp is not None:
													print(temp.data      ,						end='->'    )
													__a							=   temp.next


# Code execution starts here
if __name__ == "__main__":
	# Start with the empty stack
	lowerCamelCase_				:		Stack[int]       						=       Stack()

	# Insert 4 at the beginning. So stack becomes 4->None
	print("""Stack operations using Doubly LinkedList""")
	stack.push(4)

	# Insert 5 at the beginning. So stack becomes 4->5->None
	stack.push(5)

	# Insert 6 at the beginning. So stack becomes 4->5->6->None
	stack.push(6)

	# Insert 7 at the beginning. So stack becomes 4->5->6->7->None
	stack.push(7)

	# Print the stack
	stack.print_stack()

	# Print the top element
	print("""\nTop element is """, stack.top())

	# Print the stack size
	print("""Size of the stack is """, len(stack))

	# pop the top element
	stack.pop()

	# pop the top element
	stack.pop()

	# two elements have now been popped off
	stack.print_stack()

	# Print True if the stack is empty else False
	print("""\nstack is empty:""", stack.is_empty())





from dataclasses import dataclass
from typing import Callable, Optional

import datasets


@dataclass
class 						a__							(   datasets.BuilderConfig		):
			A__				:   Optional[Callable]								=			None
			A__				:   Optional[dict]								=			None
			A__				:   Optional[datasets.Features]								=			None



			def __SCREAMING_SNAKE_CASE							(						self    ) ->    Any:
								assert self.generator is not None, "generator must be specified"

								if self.gen_kwargs is None:
													__a							=   {}






class 						a__							(   datasets.GeneratorBasedBuilder		):
			A__				:   List[Any]								=			GeneratorConfig



			def __SCREAMING_SNAKE_CASE							(						self    ) ->    Tuple:
								return datasets.DatasetInfo(features=self.config.features    )



			def __SCREAMING_SNAKE_CASE							(						self      ,						UpperCAmelCase    ) ->    Optional[int]:
								return [datasets.SplitGenerator(name=datasets.Split.TRAIN      ,						gen_kwargs=self.config.gen_kwargs    )]







			def __SCREAMING_SNAKE_CASE							(						self      ,						**UpperCAmelCase    ) ->    Tuple:
								for idx, ex in enumerate(self.config.generator(**UpperCAmelCase    )    ):
													yield idx, ex




