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: ['r', 'o', 'n', '219', 'a', '419', 'x', '261', 'h', 's', '373', '155', 's', '171']

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

PROBLEM: ['i', 'f', 'g', '267', '113', '93', 'r', '401', 'g', 'e']

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

PROBLEM: ['271', '9', 'v', '93', 'f', 'd']

SOLUTION:
1, 2, 3, 7, 9