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: [90, -50.591, -28.979, -87, 20.633, -92, 27, 21]

[90, -87, -92, 27, 21]