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: ['t', '103', '349', '203', 'b', 'z', 'i', '337', 'y', '137', '77', 'p', 'k']

A: 0, 1, 2, 3, 4, 7, 9
****
Q: ['461', 'u', 't']

A: 1, 4, 6
****
Q: ['k', 'x', '299', 'a', 'y', '105', 's', '249', 'g', '439', 'k', '1', 'h', 'd', '43']

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