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: ['x', '91', 'q', '417', '385', '455', '393', 'm', 's', 'c', '91', '71', 'n']

SOLUTION: 1, 3, 4, 5, 7, 8, 9

PROBLEM: ['e', 's', '271', 'k', 'e', 'y', '89']

SOLUTION: 1, 2, 7, 8, 9

PROBLEM: ['s', '75']

SOLUTION:
5, 7