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: ['q', 'g', 'z', '309']

SOLUTION: 0, 3, 9

PROBLEM: ['e', 'o', 'c', 'j', 'g', '249', 's', 'b', 'f', '359', '107', 'i']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['291', 'y', '485', '389', '261', '315', 'h', '453']

SOLUTION:
1, 2, 3, 4, 5, 6, 8, 9