Write a function called `filler(A, l)` that takes an integer `A`, and a list of integers `l` and if some of the numbers

[answerhappygod]

Write a function called `filler(A, l)`
that takes an integer `A`, and a list of integers `l`
and if some of the numbers in `l` sum up to `A` then
it returns a list of these numbers. Otherwise, it returns
`None`. For example,
filler(5, [1,6,3,4]) returns [1,4].
filler(5, [1,6,3,7]) returns None.
filler(0, [-1,-1,2,-3]) returns [-1,-1,2].
filler(10, [2,3,2,3,1]) returns [2,3,2,3].
If there are multiple answers, then return any of them.
You can use each number in the list once for each occurence.
"""
def filler(A, l):
# remove the following line to solve this question
return