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: [[19, 31, 17], [-4, 1, 3, 22, -45], [42, 15, 3, -31, -31]]

[10013, 11880, 1816290]