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: ['45', 'n', 'u', '199', 'y', 'w']

SOLUTION: 1, 4, 5, 9

PROBLEM: ['93', '277', '373', 'z', '9', 'r', '251', '207', 'v', 'n']

SOLUTION: 0, 1, 2, 3, 5, 7, 9

PROBLEM: ['h', '249', '349', '27', '327', '141', '29', 'k']

SOLUTION:
1, 2, 3, 4, 7, 9