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.
One example is below.
Q: ['q', '31', 'a', 'd', '53', '85', 'p', '77']
A: 1, 3, 5, 7, 8
Rationale: Here, the numbers in the list are '31', '53', '85' and '77', and the unique digits used in the list are '1, 3, 5, 7, 8' in ascending order.
Q: ['q', '213', '381', '399', '345']
A:

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, 5, 8, 9