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, 26, -47], [31, 7, -29], [40, 1, -11, -43, 30], [39, 9, 44, -43, -21], [30, 4, 42], [-46, 20, 11, 44, 46], [-36, -37, 40, 50, 9], [49, -15], [42, -4, -2], [-31, 40, -18, 33], [33, -20, 16], [-16, -14, -14], [-45, -31, -35], [-40, -9, 4, 50, 7], [15, 3, 50, 8, 17]]
Student:
[26, 0, 1200, 44, 5040, -1862080, -72000, 0, 336, -720, -320, -3136, 0, -8000, 400]