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: [-21.717, 17.381, 10.979, -53.978, 47.395, 20, -11, -32.307, -18]

[20, -11, -18]