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]: ['25', 'n', 'n', '481', 'w', '91', '251']
[A]: 1, 2, 4, 5, 8, 9


[Q]: ['449', '427', 'g', '397', '439', 'f', 'b', 'z', 't', 'f', 's', '379', 'o']
[A]: 2, 3, 4, 7, 9


[Q]: ['81', 'u', 'p', 'k']
[A]:
1, 8