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: ['f', '73', 'k', '333', '345', 'e', 'x', 'j']

SOLUTION: 3, 4, 5, 7

PROBLEM: ['z', 'v', 't', 'm', '51', 'e', 'l', 'l', '83', '301', '21', '347', 'm', '41', 'b']

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

PROBLEM: ['n', 'i', '95', 'w', 'l', 'f', '285']

SOLUTION:
2, 5, 8, 9