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: ['d', '335', '23', '461', '497', 'p', '313']

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

PROBLEM: ['h', 't', '371', 'e', '153', 'b']

SOLUTION: 1, 3, 5, 7

PROBLEM: ['455', '409', '71', 'h', 'e', 'y', 't', '111', 'w', '473', 'v']

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