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: [[13, -31, 43, -35, -13], [30, -3], [26, -49, 12, -31], [-42, 5, -43, 16]]

[-7884695, -90, 473928, 144480]