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: ['421', '99', '115', 'x']

SOLUTION: 1, 2, 4, 5, 9

PROBLEM: ['z', '209']

SOLUTION: 0, 2, 9

PROBLEM: ['d', '351', '357', 'q', 'b', '19', 'r', '231', '381', 'x', 'a', 'y', '263']

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