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', 't']

SOLUTION: -1

PROBLEM: ['r', '233']

SOLUTION: 2, 3

PROBLEM: ['a', 'y', '231', '391']

SOLUTION:
1, 2, 3, 9