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: ['h', 'e', 'v']

SOLUTION: -1

PROBLEM: ['187', '461', 'b']

SOLUTION: 1, 4, 6, 7, 8

PROBLEM: ['159', '11', '109', 'j', 'r', '395', 'e', '417', 'e', 'g', '345', '449']

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

