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: [[31, 7, 29, 21], [34, -32], [-11, 39, 21, -33], [-26, -15, -29, -7]]

[132153, -1088, 297297, 79170]