Definition: 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.
Input: [[5, -17, 12], [26, -31], [-8, -26, -2, -1]]

[-1020, -806, 416]