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: ['9', '129', '467', '59', 'm', 'n', 'd', '107']

SOLUTION: 0, 1, 2, 4, 5, 6, 7, 9

PROBLEM: ['i', 'f', '109']

SOLUTION: 0, 1, 9

PROBLEM: ['e', '33', 'k', '491', '123', '279', '435', 'k', '437', '183', '375', '349', 'x', '443']

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