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: ['n', 'm', 'u', '267']

A: 2, 6, 7
****
Q: ['q', 'u', '199', 'v', '249']

A: 1, 2, 4, 9
****
Q: ['a', 'v']

A:
-1
****
