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: ['243', '1', 'j', 'e', '171', 'k', '177', '85', '367', 's', 't', '107', 'z', '283', '15']

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

PROBLEM: ['299', '95', 'd', '423', 'q', 'u', '167', '209', '477', 'h', 'k', 'a', '213']

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

PROBLEM: ['s', 'j', '255', '19']

SOLUTION:
1, 2, 5, 9