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: ['b', 'n', '369', '199', 'r', '165', '63', 'y', '331', '57']

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

PROBLEM: ['x', 'a', '381', 'k', 'n', 'm', '267', 'r', '193', 'f', 'h', 'r', '327', 'i', 'h']

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

PROBLEM: ['423', '255', 'v', '309', 'l', 'h', 'h', 'f', 'q']

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