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: ['i', '249', '287']

SOLUTION: 2, 4, 7, 8, 9

PROBLEM: ['y', 'o', '287', 'm', 's', '61']

SOLUTION: 1, 2, 6, 7, 8

PROBLEM: ['w', '233', 'j', '427', '383', '233', '395', 'u']

SOLUTION:
2, 3, 4, 5, 7, 8, 9