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: ['157', 'k', 'o', 'a', '279', 'g']

SOLUTION: 1, 2, 5, 7, 9

PROBLEM: ['j', '259', 'r', '363', '149', 's', 'p', 'l', '271', '93', '205', 's', 'r', 'v', 'z']

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

PROBLEM: ['53', 'v', 'l', '461', '229', 'k', 'c', '43', 'i', '187', '245', 'y', 'u', 'n', 'y']

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