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: ['u', '157', '63', '411', 'x', 'c', 'k', 'z', 'i', '279', '311', '431']

A: 1, 2, 3, 4, 5, 6, 7, 9
****
Q: ['469', 'y', 'j', 'u', '475', 'k', 'k']

A: 4, 5, 6, 7, 9
****
Q: ['q', '247', '175', '339', '155', 'e', '307', '419']

A:
0, 1, 2, 3, 4, 5, 7, 9
****