Passes inputs with indecies in s. By default passes the whole inbox.

    Arguments:

      - s(sequence) [default: ``None``] The default translates to a range for
        all inputs of the "inbox" i.e. ``range(len(inbox))``

def spasser(inbox, s=None):
    """
    Passes inputs with indecies in s. By default passes the whole inbox.

    Arguments:

      - s(sequence) [default: ``None``] The default translates to a range for
        all inputs of the "inbox" i.e. ``range(len(inbox))``
    
    """
    seq = (s or range(len(inbox)))
    return [input_ for i, input_ in enumerate(inbox) if i in seq]