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: [[-18, -42, 42, -19], [13, 4, -29], [-45, -44, -14, -20], [-48, -10, -47, 50]]

[-603288, -1508, 554400, -1128000]