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: ['345', 'h', '9']

SOLUTION: 3, 4, 5, 9

PROBLEM: ['s', '443', '239', 't', '99']

SOLUTION: 2, 3, 4, 9

PROBLEM: ['223', '403', '191', '21']

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

