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: ['493', '441', '3', 'p', '23', 'x', 'n', '417', '299', 'v', 'l', '415']

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

PROBLEM: ['r', 'u', '83', 'x', '155', '89', 'c', '391', '41', 'o', 'i', '161']

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

PROBLEM: ['303', 's', '211', 'q']

SOLUTION:
0, 1, 2, 3