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: ['3', '181', 'o', '425', 'f', '391']

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

PROBLEM: ['239', 's', 'h', 'w', '131', 'i', 'x']

SOLUTION: 1, 2, 3, 9

PROBLEM: ['205', '347', '423', 'm', '363', 'u', 'g']

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