>>> from rain import rain2

>>> rain2 ([300, 200, 400, 500, 450, 600, 550, 200, 400])
([200, 450, 200], [500, 600])
>>> rain2 ([300, 400, 450, 455, 450, 300, 240, 200, 199])
([], [455])
>>> rain2 ([300, 200, 400, 200, 450, 300, 550, 200, 400])
([200, 200, 300, 200], [400, 450, 550])