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: ['45', '95', 'y', '363', '265', '307', '309', '423']

SOLUTION: 0, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['b', '351', 'g', 'k', '29', '15', '411', '97', 'r', '27', '279']

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

PROBLEM: ['229', '91', '69', 'q']

SOLUTION:
1, 2, 6, 9