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', '249', '287']

SOLUTION: 2, 4, 7, 8, 9

PROBLEM: ['93', 'h', 'd', 'z', '395', 'r', 'j', 'f', '323', '215', 'n', 's', '497']

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

PROBLEM: ['105', 'n', 'v', 'm', 'a', 'i', 'n', 'x']

SOLUTION:
0, 1, 5