Definition: 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.
Input: ['y', 't', '23', '197', 'x', '229', '473', '169', 'b', 'k', 'm']

1, 2, 3, 4, 6, 7, 9