Detailed Instructions: 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: ['v', 'x', 'z', '399', 'u', 't', 'j', '467', '181', 'a', '489', 'u']
A:
1, 3, 4, 6, 7, 8, 9