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: ['b', 'g', '181', 'y', 'd', 'v', '95', 'h', 'n', '103', '41', 'm', 'h', '445', 'z']

SOLUTION: 0, 1, 3, 4, 5, 8, 9

PROBLEM: ['291', 'p', '261', 'z', '21', 'w', 't', '417']

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

PROBLEM: ['y', 'l', 'f', 'j']

SOLUTION:
-1

