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: ['g', '185', '73', 'h', '455', '333', 'l', '403', 'k', 'e', '77', '429', '423', '453']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['k', '413', '321', '209', 'k', '263']

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

PROBLEM: ['237', '367']

SOLUTION:
2, 3, 6, 7