>>> from paraules import pos_millor

>>> pos_millor(['vent', 'pluges', 'sol', 'boira'], [1, 1, 5, 1])
2
>>> pos_millor(['fulla', 'riu', 'neu'], [1, 2, 1])
0

>>> pos_millor(['sol', 'lluna', 'cel'], [2, 1, 4])
2
>>> pos_millor(['a', 'casa', 'mar'], [5, 0, 2])
0
>>> pos_millor(['ou', 'mantega', 'pa'], [3, 0, 4])
1
>>> pos_millor(['vent', 'pluges', 'sol', 'boira', 'mar'], [3, 0, 6, 0, 1])
2