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: [91, -17, -28.371, -20.153, -3.578, -3.397, -2.955, 6.317, 13.399, 56.586, -3.172]

[91, -17]