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.

Q: ['k', '135', '297']

A: 1, 2, 3, 5, 7, 9
****
Q: ['g', 'j', '239', 'w', 'q', 'm', 'a', 'l', 'n', 'p', 'i', 'r']

A: 2, 3, 9
****
Q: ['269', 'b', 's', 't', '287', '389', 'd', 'k', 'n']

A:
2, 3, 6, 7, 8, 9
****