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.

['u', 'm', 's', '101', '427', 'h', 'i', '463', 'j', '77', '465', 'r']
0, 1, 2, 3, 4, 5, 6, 7

['355', 'h', '287', 's', 'o', '497', '219']
1, 2, 3, 4, 5, 7, 8, 9

['281', '341', 'f', 'x', '399', 'f', '323', 'w', 'q', 'd', 'd']

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
1, 2, 3, 4, 8, 9

