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: ['71', '7', '341', '199', 'z', 'x', '201']

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

PROBLEM: ['3', '181', 'o', '425', 'f', '391']

SOLUTION: 1, 2, 3, 4, 5, 8, 9

PROBLEM: ['z', 'k', '253', '413', 'g', '293', '89', 'c', 'u', '207']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 8, 9