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: ['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: ['f', '463', '169', '175']

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

PROBLEM: ['s', 'y', '325', 'u', '431', 'd', 'k', '217', 'b', 'l', 'n', '125']

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