In this task you will be given a list of integers. You should only return an integer if the first digit is the same as the last digit in the number. If an integer has a single digit, then it should be returned. If there are no integers that start and end with the same digit then an empty list ("[]") should be returned.
[-669, -231, 473, -322, 350, -566, 219, -154, -409, 591, 988, 512, -321, -516, 479, 598]