Definition: In this task you will be given a list of numbers. You should remove any number that is not an integer (whole number). If every number is not an whole number then an empty list ("[]") should be returned. Otherwise, answer with the list of whole numbers separated by comma inside brackets.
Input: [21.412, 43, 56.146, 6.599, 16.273, -11.846, -2, 15, -42.506, 21.612]

[43, -2, 15]