In this task you will be given a list of lists, of numbers. For every inner list, you should multiply every number in that list and put the results in your answer. The output should be a list of numbers with the same length as the number of the lists in the input list.
[[18, -23], [29, -34, 36], [20, -15, -39, -16, 29], [-31, 4], [36, -27, 5], [-32, 31, 39, 42, -1]]