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: [[14, 5, 6, 31], [44, -39, 18], [-32, 8, 18, -2], [-46, -17], [10, 23, 10], [-42, 13, 13, -17, -12]]
A: 
[84, 792, 9216, -46, 100, 504]