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: ['c', '381', '277', '369', 'f', '437', '169', '269', 'a']

1, 2, 3, 4, 6, 7, 8, 9