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: ['71', 't', '267', 'x', 'l', '95', '439', '51', 'i', '497', '469', 'k', '341', 'y']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['h', 'i', 'e', '319', 'g', '187', '395', 'f', '327', 'y']

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

PROBLEM: ['f', '317', 'y', '319', 'd', '217', '339', '403', '383', 'p', '457', 'n', 'b', '37']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 8, 9