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.

['s', 'd']
-1

['7', 'u', 's', '75', 't', 'o']
5, 7

['471', 'r', '81', 'v', 'z']

1, 4, 7, 8