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: [[47, -1], [-5, 40, 33, 39], [-28, -26, 8], [43, 1, 29, -19]]

[-47, -257400, 5824, -23693]