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: ['25', 'n', 'n', '481', 'w', '91', '251']

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

PROBLEM: ['157', '481', 'n', 't', 'd', 'j']

SOLUTION: 1, 4, 5, 7, 8

PROBLEM: ['y', 'r', 'y', 't', 'v', 'c', '65', 's', '61', '399', '229', 'f', '275', '205', '315']

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