Dice game
=========

We want to play a variant of the dice game called *craps* where there is 
a starting two dice roll and the following rules:

-  If dice add up to 7 or 11 the player wins.
-  If dice add up to 2, 3 or 12, the player loses.
-  With any other combination, the player keeps playing.

Write the function :py:func:`dice2` that takes two values
corresponding to the result of a two dice roll, and returns an
integer: 0 if the player keeps playing, 1 if the player wins and 2 if
the player loses. The function must check if the dice values are right
(they are between 1 and 6) and must return -1 if they aren't right.

Save this function into a file named :file:`dice_game.py`. Examples:

  .. literalinclude:: dice_game.txt
     :language: python3
     :lines: 3-

  .. note::
     More tests are provided in the :download:`dice_game.txt <dice_game.txt>`

.. rubric:: Solutions

A solution of this function is provided in the :download:`dice_game.py <solutions/dice_game.py>`