

import inspect
import warnings
from typing import Any, Dict, Optional, Union

from packaging import version
def 						_snake_case(    *SCREAMING_SNAKE_CASE__			:	Optional[Any]    ,			SCREAMING_SNAKE_CASE__			:	Optional[Union[Dict, Any]] = None    ,			SCREAMING_SNAKE_CASE__			:	Union[str, Any]=True    ,			SCREAMING_SNAKE_CASE__			:	int=2      )							->      Optional[int]:





    '''simple docstring'''






    from .. import __version__

    A__          =   take_from
    A__          =   ()
    if not isinstance(args[0]    ,			SCREAMING_SNAKE_CASE__      ):
        A__          =   (args,)

    for attribute, version_name, message in args:
        if version.parse(version.parse(SCREAMING_SNAKE_CASE__      ).base_version      ) >= version.parse(SCREAMING_SNAKE_CASE__      ):
            raise ValueError(
                f'The deprecation tuple {(attribute, version_name, message)} should be removed since diffusers\''
                f' version {__version__} is >= {version_name}'      )

        A__          =   None
        if isinstance(SCREAMING_SNAKE_CASE__    ,			SCREAMING_SNAKE_CASE__      ) and attribute in deprecated_kwargs:
            values += (deprecated_kwargs.pop(SCREAMING_SNAKE_CASE__      ),)
            A__          =   f'The `{attribute}` argument is deprecated and will be removed in version {version_name}.'
        elif hasattr(SCREAMING_SNAKE_CASE__    ,			SCREAMING_SNAKE_CASE__      ):
            values += (getattr(SCREAMING_SNAKE_CASE__    ,			SCREAMING_SNAKE_CASE__      ),)
            A__          =   f'The `{attribute}` attribute is deprecated and will be removed in version {version_name}.'
        elif deprecated_kwargs is None:
            A__          =   f'`{attribute}` is deprecated and will be removed in version {version_name}.'

        if warning is not None:
            A__          =   warning + ' ' if standard_warn else ''
            warnings.warn(warning + message    ,			SCREAMING_SNAKE_CASE__    ,			stacklevel=SCREAMING_SNAKE_CASE__      )

    if isinstance(SCREAMING_SNAKE_CASE__    ,			SCREAMING_SNAKE_CASE__      ) and len(SCREAMING_SNAKE_CASE__      ) > 0:
        A__          =   inspect.getouterframes(inspect.currentframe()      )[1]
        A__          =   call_frame.filename
        A__          =   call_frame.lineno
        A__          =   call_frame.function
        A__      ,						A__          =   next(iter(deprecated_kwargs.items()      )      )
        raise TypeError(f'{function} in {filename} line {line_number-1} got an unexpected keyword argument `{key}`'      )

    if len(SCREAMING_SNAKE_CASE__      ) == 0:
        return
    elif len(SCREAMING_SNAKE_CASE__      ) == 1:
        return values[0]
    return values



def 				a						(							snake_case__:					list					):


				'''simple docstring'''

				if len(snake_case__					) <= 1:
								return [tuple(snake_case__					)]

				lowercase_       =					[]

				def generate(snake_case__:					int						,   snake_case__:					list					):
								if k == 1:
												res.append(tuple(arr[:]					)					)
												return

								generate(k - 1						,   snake_case__					)

								for i in range(k - 1					):
												if k % 2 == 0:  # k is even
																lowercase_  ,	lowercase_       =					arr[k - 1], arr[i]
												else:  # k is odd
																lowercase_  ,	lowercase_       =					arr[k - 1], arr[0]
												generate(k - 1						,   snake_case__					)

				generate(len(snake_case__					)						,   snake_case__					)
				return res


if __name__ == "__main__":
						__a  			=					input('Enter numbers separated by a comma:\n').strip()
						__a  			=					[int(item) for item in user_input.split(',')]
						print(heaps(arr))




