Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
[[7, -3, -3, 11], [-6, -6, -5, 2], [-8, 4, -3]]
Solution: [0, 72, -32]
Reason: The first inner list has no even integers, so the first number in the output is 0. The second list has -6, -6, 2 for even integers so the second output is 72. The third list has -8, 4 as even numbers so the third output is -32. This is a good example.

Now, solve this instance: [[-23, 22], [-17, 31, -6, -50], [43, 37, 1, -39, -16], [31, -37, 10], [-32, 12, -42, -38, 8], [18, -42, 15], [-24, -31, -47], [40, 18, -5, 30], [-50, 18, 44, 38, 8], [5, -6, -40], [31, 19, 9, 35], [-12, 43, -3, -13], [-33, 22, 44, 8, -22], [-48, 28, 3, 16], [-45, -46]]
Student:
[22, 300, -16, 10, -4902912, -756, -24, 21600, -12038400, 240, 0, -12, -170368, -21504, -46]