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: ['i', 'e', '17', 'q', '15', 'v']

SOLUTION: 1, 5, 7

PROBLEM: ['k', '373', 'b', '305', 'i', 'n', 'z', 'm', 'c']

SOLUTION: 0, 3, 5, 7

PROBLEM: ['t', 'u', '199', 't', '127', '165', 't', '227', 'y', 'o', '227']

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