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: ['p', 'n', 'c', '113', '105', '423', 'k', 'a', '211', 'k', '91', '389']

SOLUTION: 0, 1, 2, 3, 4, 5, 8, 9

PROBLEM: ['w', '19', '61', 'j', 'o', 's', 'q', '391', '281', '491', '287']

SOLUTION: 1, 2, 3, 4, 6, 7, 8, 9

PROBLEM: ['c', 'c', 'c', '297', 'u', 'i', '393', '181', 'e', 'y', '467']

SOLUTION:
1, 2, 3, 4, 6, 7, 8, 9