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.
[508, 377, -309, -100, -486, -517, 449, -382, 511, 638, -840, 211, 963, 640, -252, 490, -656, 638, -432, -639, 953, -478]