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]: ['279', '115']
[EX A]: 1, 2, 5, 7, 9

[EX Q]: ['p', 'p', '91']
[EX A]: 1, 9

[EX Q]: ['297', 'f', 's', '97', '367', 'y', 'r', '389', 'p']
[EX A]:
2, 3, 6, 7, 8, 9