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: ['233', '37', '221', 'n', 'j', 'y', '381', '175']

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

PROBLEM: ['243', '125']

SOLUTION: 1, 2, 3, 4, 5

PROBLEM: ['35', '21', '89']

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