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: ['87', '139', 'y', '129', '255', '227', '103', 'j']

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

PROBLEM: ['119', '189', 'k', 'e', '425', '21', '245']

SOLUTION: 1, 2, 4, 5, 8, 9

PROBLEM: ['b', '279', 'd', '103']

SOLUTION:
0, 1, 2, 3, 7, 9