Definition: In this task you will be given a list, of lists, of integers. For every inner list contained in the input list, you should multiply every even number in that list. The output should be a list of integers with the same length as the number of lists in the input list. If there are no even numbers in an inner list you should output 0 for that list.
Input: [[27, 33, 8, -38], [33, 34], [-29, 12, 40, -1, -41], [46, 21]]
Output:
[-304, 34, 480, 46]