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: ['v', 'j', 'l', 'f', 'n', '185', 'x', '367']

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

PROBLEM: ['279', 'm', '453', 's', 'x', 'g', 'i', 'x', 'd']

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

PROBLEM: ['y', '123', '405', '253']

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