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: ['483', '409', '129', 'u', '167', '275', 'p', '163', 'r', 'q', 'i', '481', 'j', '271']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['a', '399', 's', 'e', '495', 'd', 'f', 'a', '323']

SOLUTION: 2, 3, 4, 5, 9

PROBLEM: ['451', '243', 'd', '87', 'z', '171', 'p', 'q', 'i', '125', '9', 'v', 'r', 'x']

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

