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: ['s', 't', '189', 'j', 'r']

SOLUTION: 1, 8, 9

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: ['d', 's', '429', 'b', 'j', 'y', 'p', 'g', '43', '347', 's', '313', 'u', '319', '41']

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