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: ['497', '247', 'v', '327', '237', '257', '475', 's', '335', 'k']

SOLUTION: 2, 3, 4, 5, 7, 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: ['127', '37', 's', 'b', 'n', '327', 'h', '485']

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