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: ['i', 'f', '109']

SOLUTION: 0, 1, 9

PROBLEM: ['v', 'i', 'g', 'h']

SOLUTION: -1

PROBLEM: ['375', '189', 'u', 'y']

SOLUTION:
1, 3, 5, 7, 8, 9

