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.
Q: [[1, 39, 7, -18], [43, -13, 3], [-6, 12, -12], [21, 50], [-44, 48]]
A: 
[-18, 0, 864, 50, -2112]