'''simple docstring'''





from __future__ import annotations
def 				__lowercase	(						lowerCamelCase__ ,				lowerCamelCase__					)				->list[int]:

  '''simple docstring'''




  assert len(lowerCamelCase__					) == len(lowerCamelCase__					)

  a__     		=     len(lowerCamelCase__					)
  a__     		=     list(range(lowerCamelCase__					)					)
  a__     		=     [-1] * n  # who the donor has donated to
  a__     		=     [-1] * n  # who the recipient has received from
  a__     		=     [0] * n

  while unmatched_donors:
    a__     		=     unmatched_donors[0]
    a__     		=     donor_pref[donor]
    a__     		=     donor_preference[num_donations[donor]]
    num_donations[donor] += 1
    a__     		=     recipient_pref[recipient]
    a__     		=     rec_record[recipient]

    if prev_donor != -1:
      if rec_preference.index(lowerCamelCase__					) > rec_preference.index(lowerCamelCase__					):
        a__     		=     donor
        a__     		=     recipient
        unmatched_donors.append(lowerCamelCase__					)
        unmatched_donors.remove(lowerCamelCase__					)
    else:
      a__     		=     donor
      a__     		=     recipient
      unmatched_donors.remove(lowerCamelCase__					)
  return donor_record


def 				__lowercase	(						lowerCamelCase__ ,				lowerCamelCase__					)				->Optional[int]:

  '''simple docstring'''




  sequence.append(lowerCamelCase__					)

  a__     		=     0
  while sequence[index] != target:
    index += 1

  sequence.pop()

  if index == len(lowerCamelCase__					):
    return None

  return index


if __name__ == "__main__":
     _SCREAMING_SNAKE_CASE   						=    input("""Enter numbers separated by comma:\n""").strip()
     _SCREAMING_SNAKE_CASE   						=    [int(item) for item in user_input.split(""",""")]

     _SCREAMING_SNAKE_CASE   						=    input("""Enter a single number to be found in the list:\n""")
     _SCREAMING_SNAKE_CASE   						=    int(target_input)
     _SCREAMING_SNAKE_CASE   						=    sentinel_linear_search(sequence, target)
     if result is not None:
          print(F"""{target} found at positions: {result}""")
     else:
          print("""Not found""")

