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: ['201', 'm', '157', 's', 'n', 'i', '325', 'x', '247', 'u', '187', 'e', '199']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['v', 'r', '67', '49']

SOLUTION: 4, 6, 7, 9

PROBLEM: ['495', 'h', 'v', 'y', '31', 'q', '121', '149']

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