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]: ['n', 'm', 'u', '267']
[A]: 2, 6, 7


[Q]: ['189', 'z']
[A]: 1, 8, 9


[Q]: ['269', '321', '31', 'e', 'd', 'y', 'r', 'b']
[A]:
1, 2, 3, 6, 9