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

['119', '329', 'w']
1, 2, 3, 9

['369', '13', 'g']

1, 3, 6, 9