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: [-1.649, 7.531, -24.05, 25.283, 19.649, -21, 35.647, -42.008, -17.663]

[-21]