Create a python function where we take in a link list and return the same link list but only the nodes that have a position that is divisible by 2 an example would be

we would take in this list:

10 -> 20 -> -1 -> "asdf" -> 13 -> "qwerty" -> 1024

and return:

20 -> "asdf" -> "qwerty"

The function should be defined as def accordion(head):