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.

['j', 't']
-1

['k', 'q', 'a', 'u', 'q']
-1

['m', 'n', '135', '21', 'r', '487', 'x', 'x', 'f', 't']

1, 2, 3, 4, 5, 7, 8