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: ['497', '247', 'v', '327', '237', '257', '475', 's', '335', 'k']

A: 2, 3, 4, 5, 7, 9
****
Q: ['187', '461', 'b']

A: 1, 4, 6, 7, 8
****
Q: ['b', 'b', 'm']

A:
-1
****
