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]: ['b', 'm', '471']
[A]: 1, 4, 7


[Q]: ['255', 'u', 's', 'g', '445']
[A]: 2, 4, 5


[Q]: ['259', '491', '411', 'p', 'f', 'y', '195', 'e', '79', 'k', 'z', 'o', '379']
[A]:
1, 2, 3, 4, 5, 7, 9