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: ['299', '199']

SOLUTION: 1, 2, 9

PROBLEM: ['y', 'v', '311', 'f', '273']

SOLUTION: 1, 2, 3, 7

PROBLEM: ['w', 'j', 'e', '67']

SOLUTION:
6, 7

