Mapping Get Item at Index to a List

The problem I seem to be having here is taking the first item (0) on list “A” to get item at index of the first list of lists (0,5) on list “B”… (1) to (1,8)… etc… Instead I get all 6 items at index for all 6 list of lists. How can I just take the first item to just first list of list? Thanks.


Found the solution… much simpler than I was thinking of it. See below: