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.

[EX Q]: ['v', 'r', '67', '49']
[EX A]: 4, 6, 7, 9

[EX Q]: ['v', 'w', 'k']
[EX A]: -1

[EX Q]: ['n', '397', 'k', '335', '339']
[EX A]:
3, 5, 7, 9