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.
[600, 671, 629, -652, 141, 164, -20, -703, 393, 373, -620, 429, 890, -299, 881, -436, -861, 664, 512, 421]