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: ['181', 'n', 'p', '349', '321', '457', 'h', 's', 't', 'k', 'x', 'a', '145', '135', 'u']

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

PROBLEM: ['87', '353', '329', '163', 'i', 'd', '287']

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

PROBLEM: ['85', '399', 'v', '217', '371', 'c', '451', '323', '399', 'f', 'c', '367']

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