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: ['t', '437', 'o', 'w', 'x', 'e', 'r', 'r', '149', 'd', '391']

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['s', 't', '189', 'j', 'r']

SOLUTION: 1, 8, 9

PROBLEM: ['469', '65', '111', '135', '209', 'g', '407', 'd', 'r', '325']

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