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: ['169', '159', '103', '245', '449', 'a', 'w', 'b', '131', '385']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 8, 9

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

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

PROBLEM: ['x', 'f', 's', '119', '431', 'c', 'f']

SOLUTION:
1, 3, 4, 9