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: ['391', 'y', '447', '345', '157', '265', 'x', '261', 'm', 'f', 'x', 'x', '379', 'r', 'g']

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

PROBLEM: ['371', '459', '9', 'j', '425', 'k', '495', 'x', '105', '49', 'j', '101', 's']

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

PROBLEM: ['335', 't', 'g', 'r', '439', 'v', 'j', 'a', 'c', 's', 'j', '377', 'x', 'j', 'q']

SOLUTION:
3, 4, 5, 7, 9