Definition: 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.
Input: [-726, -430, -648, 171, 562, 944, -396, -666, 876, 889, -634, 972, 502, 653, 805, 973, -752, 846, -586, -723, 159, -3, 18]

[171, -666, -3]