TASK 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.
PROBLEM: ['299', '199']

SOLUTION: 1, 2, 9

PROBLEM: ['211', 'v', 'a', '445', '185', '135', 'v', 'w', 'b', '155', '315', '1']

SOLUTION: 1, 2, 3, 4, 5, 8

PROBLEM: ['g', 'x', '391', '497', 'w', '391', 'r', 'd', 'j', '433', 'q', '393']

SOLUTION:
1, 3, 4, 7, 9