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', '115']

SOLUTION: 1, 2, 5, 7, 9

PROBLEM: ['93', 'z', '495', 'l', '65', '233', 'h', 'm', 'f', '249', 'w', '35', '337', 'j', 'm']

SOLUTION: 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['185', '479', 'i', '247', 's', 'x', '247', 'e', '305', 'g', 'c', '101']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 8, 9