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: ['303', '287', 'c', '135', '7', 'a', '495', 'p']

0, 1, 2, 3, 4, 5, 7, 8, 9