>>> from balla import balla

--ini

>>> l = [5, 2, 4, -1, 6, -3, 1, -7]

>>> balla(l, 0)
[0, 5, 2, 6, 7, 0]

>>> balla(l, 4)
[4, 10]

>>> balla(l, 10)
[10]

--fi

>>> balla(l, 1)
[1, 3, 2, 6, 7, 0, 5, 2]
>>> balla(l, 2)
[2, 6, 7, 0, 5, 2]
>>> balla(l, 3)
[3, 2, 6, 7, 0, 5, 2]