Consonant Counting
==================

You are required to deliver the following function in the module :mod:`cons_module` (file :file:`cons_module.py`):

    .. py:function:: cons_count(s, sref)

such that
  
    **given**

        - *s* a non-empty :class:`str`
        - *sref* is a :class:`str`  of alphanumeric characters.

    **returns** an :class:`int` with the number of occurrences of **consonant** letters in ``s`` that also are in *sref*.

For example:

    .. literalinclude:: cons_count.test
        :language: python3
        :start-after: --ini
        :end-before: --fi

Observe that the first call is 6 because *s* contains the consonant letters 'T', 'r', 'h', 'P', 'r' and 'l' that also are in *sref*.

Doctests are available in the :download:`cons_count.test` file.