Definition: In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
Input: ['y', '355', 'a', '301', '155', '307', 'b', 't', 'g', '281']

0, 1, 2, 3, 5, 7, 8