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# Task 4 of the Code Challenge is... picky?

Hi,

For the last task, 4 of 4, the auto-grader won't accept this solution:

```def reverse_evens(iter_item):
return iter_item[-1::-2]
```

However, running this locally works:

```>>> a = list(range(1,6))
>>> a
[1, 2, 3, 4, 5]
>>> a[-1::-2]
[5, 3, 1]
```

Any of you ran into this as well? Thanks!

## Your code sort of works, but it only works for lists that have an odd length.

If the length of the list is even, you should do`iter_item[0::-2]`. However, as I said, that snippet only works for lists length even.

So, you would probably have to use an `if/else` statement to test if the length of the list is even or odd

Here's a hint:

To test if a number is even, you can do this:

Pretend I'm in the Shell

```>>> a = 10
>>> a % 2 == 0  # This tests "is a even?", and it is so Python returns True
True
>>> b = a - 1  # In this case, b will be 9 (which is a - 1)
>>> b % 2 == 0
False
```

If you have questions on the `%` operator, respond below with the text `#modoperator` inside and I'll explain. :)

I hope this helps

Happy coding!

~Alex