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]: ['25', 'b', '455', 'n', '305', '271']
[EX A]: 0, 1, 2, 3, 4, 5, 7

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

[EX Q]: ['137', 'k', '455', '37', 'h', '271', 'p', '145', '11', '473', 'u', 'z', 'k', '207', 'm']
[EX A]:
0, 1, 2, 3, 4, 5, 7