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: ['333', '207', '13', '339', 'n', '387']

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

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

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['455', '33', 'k', '413', 'g', 'g', 'o', 'k']

SOLUTION:
1, 3, 4, 5