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.
[[-163, -174, -119, -2, -189, -40], [-1, -64, -23, -128, -130, -31, -68], [-156, 13], [-55, -106, -102, -58, -121, -100]]