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: ['c', 'u', 'b', '347', '191']

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['71', '7', '341', '199', 'z', 'x', '201']

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

PROBLEM: ['f', 'g']

SOLUTION:
-1

