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: ['t', 'v', '469', 'n']

SOLUTION: 4, 6, 9

PROBLEM: ['s', '291', '257', 'w', '497', '309']

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

PROBLEM: ['249', 'u', 'p', 'h', 'q', '67', '199', '85', '241', '33', 'q']

SOLUTION:
1, 2, 3, 4, 5, 6, 7, 8, 9