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: ['381', '129']

SOLUTION: 1, 2, 3, 8, 9

PROBLEM: ['99', '245', 'c', '435', '255', 'v']

SOLUTION: 2, 3, 4, 5, 9

PROBLEM: ['79', 'i', '227', 'k', 's', 'f', 'h', '407', '299']

SOLUTION:
0, 2, 4, 7, 9