>>> from flipa import flipa

---- ini

>>> l1 = [1, -2, 3, -3, 3, -1]
>>> l2 = [1, 1, -2, -2, 2, -1]

>>> flipa(l1, l2)
>>> l1
[1, 1, 3, -2, 3, -1]
>>> l2
[1, -2, -2, -3, 2, -1]

---- fi

>>> l1 = [-2, 3, 2, -6, 2]
>>> l2 = [0, 0, 0, 0, 0]

>>> flipa(l1, l2)
>>> l1
[0, 3, 2, 0, 2]
>>> l2
[-2, 0, 0, -6, 0]

>>> l1 = [0, 3, 2, 0, 2]
>>> l2 = [-2, 0, 0, -6, 0]

>>> flipa(l1, l2)
>>> l1
[0, 3, 2, 0, 2]
>>> l2
[-2, 0, 0, -6, 0]

>>> l1 = [-4, 3, 2, -3, 2]
>>> l2 = [0, 0, 0, 0, 0]

>>> flipa(l1, l2)
>>> l1
[0, 3, 2, 0, 2]
>>> l2
[-4, 0, 0, -3, 0]

>>> l1 = [-8, -2, -9, 0, 10, 4, -6, -5, 10, 4, 8, 3, 3, 5, -8, 6, 6, 8, 8, -8, 6, -1, -7, -10, 1, 10, 2, 3, -1, 10]
>>> l2 = [5, 6, 6, 0, -8, -8, 3, -7, 6, 7, -7, -4, 3, -4, 5, -1, -6, -7, 1, 1, -4, -3, -4, 5, -3, -2, 5, -2, -1, 4]

>>> flipa(l1, l2)
>>> l1
[5, 6, 6, 0, 10, 4, 3, -5, 10, 7, 8, 3, 3, 5, 5, 6, 6, 8, 8, 1, 6, -1, -4, 5, 1, 10, 5, 3, -1, 10]
>>> l2
[-8, -2, -9, 0, -8, -8, -6, -7, 6, 4, -7, -4, 3, -4, -8, -1, -6, -7, 1, -8, -4, -3, -7, -10, -3, -2, 2, -2, -1, 4]

>>> l1 = []
>>> l2 = []

>>> flipa(l1, l2)
>>> l1
[]
>>> l2
[]