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: [[37, 15, 12, -48], [-39, -24, 26, 9], [-28, 31, 34, -50], [18, -19, 22]]
Output:
[-576, -624, 47600, 396]