In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-86, 21, -179, -121, -189, -86], [82, -146], [18, -67, 77, 57, 82, -171]]