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: [-7.676, 68, -17.321, 6.522, -39, 52.299, 8, 35.257, 15]

[68, -39, 8, 15]