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: [15.47, -21, 7.917, -23.344, 25.975, -61.613, -56.341, 35.628, 16.262, 22.171]

[-21]