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: ['t', 'v', '469', 'n']

SOLUTION: 4, 6, 9

PROBLEM: ['101', 'o', 'j', 'q', '283', '229', '271', 'r', 'n', '481', '101', '477', 'w']

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

PROBLEM: ['f', '71', '157', '15', 'i', '383', 'k', '121', '85']

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