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: ['p', '121', '55', '205', 'n', '393', 'l', 's', 'k', 'c', 'n']

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

PROBLEM: ['273', 'b', '461', '419', '349', '301', '365', 'k', '319', 'o']

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

PROBLEM: ['s', 's', '13', '259', '37', '247', 'b', '145', '173', 'e']

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