


def  SCREAMING_SNAKE_CASE_		(    __A				:    str						,					__A				:    list[str]       )			->	Optional[int]:

       """simple docstring"""

       a_      :	Optional[Any]							=						''
       for word_or_phrase in separated:
              if not isinstance(_UpperCamelCase						,					_UpperCamelCase       ):
                     raise Exception('join() accepts only strings to be joined'       )
              joined += word_or_phrase + separator
       return joined.strip(_UpperCamelCase       )


if __name__ == "__main__":
   from doctest import testmod

   testmod()






def  SCREAMING_SNAKE_CASE_		(    __A				:    list       )			->	list:

       """simple docstring"""

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

       a_      :	Optional[Any]							=						[]

       def generate(__A				:    int						,					__A				:    list       ):
              a_      :	str							=						[0] * n
              res.append(tuple(__A       )       )

              a_      :	Optional[int]							=						0
              while i < n:
                     if c[i] < i:
                            if i % 2 == 0:
                                   a_							,	a_      :	Dict							=						arr[i], arr[0]
                            else:
                                   a_							,	a_      :	Union[str, Any]							=						arr[i], arr[c[i]]
                            res.append(tuple(__A       )       )
                            c[i] += 1
                            a_      :	Dict							=						0
                     else:
                            a_      :	Optional[Any]							=						0
                            i += 1

       generate(len(__A       )						,					__A       )
       return res


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


