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: ['j', 'w', 'h', 'r', 'w', 'h', 'd', 'f', '81', 'g', '145']

SOLUTION: 1, 4, 5, 8

PROBLEM: ['b', 'm', '471']

SOLUTION: 1, 4, 7

PROBLEM: ['93', 'i', 'h', 'b']

SOLUTION:
3, 9