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.

Q: ['51', '461', '343', '15', '209', '51']

A: 0, 1, 2, 3, 4, 5, 6, 9
****
Q: ['41', 'o', 'm', 'h', 's', 't', '407', '445', '371', '93', '291', '457', 'r', '391', 'a']

A: 0, 1, 2, 3, 4, 5, 7, 9
****
Q: ['w', 'f', 's', 'k', 'k', '67', 'u', 'z']

A:
6, 7
****