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: ['c', 'h', '151', 'g', 'd', 'd', 'k', '37']

SOLUTION: 1, 3, 5, 7

PROBLEM: ['313', 'q', '355', 'y', 'b', '267', 'd', '253', '393', '409']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['123', 'r', 'g', '237', 'x', 'l', 'e', '223']

SOLUTION:
1, 2, 3, 7