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', '343', '391', '381', 'q', '317', '403', '89', '271']

SOLUTION: 0, 1, 2, 3, 4, 7, 8, 9

PROBLEM: ['449', '427', 'g', '397', '439', 'f', 'b', 'z', 't', 'f', 's', '379', 'o']

SOLUTION: 2, 3, 4, 7, 9

PROBLEM: ['p', '97', 'b', '443', 'd', 'z', '125', 't']

SOLUTION:
1, 2, 3, 4, 5, 7, 9