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: ['k', 'x', '299', 'a', 'y', '105', 's', '249', 'g', '439', 'k', '1', 'h', 'd', '43']

SOLUTION: 0, 1, 2, 3, 4, 5, 9

PROBLEM: ['x', '281', 'n', '385', '435', 'l', 's', '445', 'n', 'n', '133']

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

PROBLEM: ['11', '75', '399', '325', '147', '139', '183', '271', 'e', '155', 's']

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