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 Input:
['25', 'b', '455', 'n', '305', '271']

Ex Output:
0, 1, 2, 3, 4, 5, 7


Ex Input:
['1', 'm']

Ex Output:
1


Ex Input:
['z', 'x', '407', 'b', 'c', 't']

Ex Output:

0, 4, 7