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: ['i', '485', '109', 'e', '15', '461', 'r', 'l', '223', '327']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['229', 'x', '49', 'p', '73', '77', '337', '497']

SOLUTION: 2, 3, 4, 7, 9

PROBLEM: ['267', 'j', '129', 'm', '17', 't', 'k', '215', '491', '123', 'x', 'u', '255', 't', '63']

SOLUTION:
1, 2, 3, 4, 5, 6, 7, 9