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', 'r', 'z']

SOLUTION: -1

PROBLEM: ['g', '411', '307', 'i', '483', 'z', '29', 't', 'f', 'z']

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

PROBLEM: ['j', 'p', '443', '435']

SOLUTION:
3, 4, 5

