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: ['279', 'y', '391', '33', '281', '113', 'd', 'v']

SOLUTION: 1, 2, 3, 7, 8, 9

PROBLEM: ['z', 'z', '273']

SOLUTION: 2, 3, 7

PROBLEM: ['277', 'b']

SOLUTION:
2, 7

