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]: ['43', '479', '317', 'w', '475', '255', '3', 'x']
[EX A]: 1, 2, 3, 4, 5, 7, 9

[EX Q]: ['i', 'e', '17', 'q', '15', 'v']
[EX A]:
1, 5, 7