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

[EX Q]: ['u', 'z', 'p', '99', 'b']
[EX A]: 9

[EX Q]: ['b', 'i', '71', '151']
[EX A]:
1, 5, 7