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.

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

['l', '269', 'l', '379', '359']
2, 3, 5, 6, 7, 9

['r', 'i']

-1

