Zipping Up a List

Two lists are part of the same zipper if the ending is identical. The identical section can be thought of as being "zipped-up". Below, [2, 2, 4] is "zipped-up".

List 1: [3, 5, 8, 9, 2, 2, 4]
List 2: [1, 7, 2, 2, 4]

Create a function that takes in two lists. Return False if none of the list is "zipped." Return True if the lists are identical. Otherwise, return a list with the first index in each list where the zipper diverges.

To illustrate:

zipper([3, 5, 8, 9, 2, 2, 4], [1, 7, 2, 2, 4]) ➞ [3, 1]
# Zipper 1: 9 (index-3) is first element to diverge.
# Zipper 2: 7 (index-1) is first element to diverge.

Examples

zipper([5, 5, 7, 8, 9, 1, 2], [3, 2, 1, 1, 6, 6, 6, 6, 1, 2]) ➞ [4, 7]

zipper([5, 4, 3, 2, 6], [6, 4, 3, 2, 6]) ➞ [0, 0]

zipper([5, 4, 3, 2, 7], [6, 4, 3, 2, 6]) ➞ False

zipper([5, 4, 3, 2, 6], [5, 4, 3, 2, 6]) ➞ True

Notes

Use zero-indexing for the lists.