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: ['q', '17', '497', '69', 'n', '25', 'a', 'j', 'c', 'j', '303', '453', 'k', 'h']

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

PROBLEM: ['493', '241', '239', 'g', 'q', '319', '49', '245']

SOLUTION: 1, 2, 3, 4, 5, 9

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