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, 17, -45, -49, -31], [42, -14], [-14, 26, -48, -8]]

[-15106455, -588, -139776]