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: ['403', 'j', 'x', '187', '311', 'g', 'z', 'p', '287', 'w', 'k', 'm']

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

PROBLEM: ['y', '301', 'c', 'l', 'x', '257', 'l', '1', 'r', '127', 'f', '157', '91', '423']

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

PROBLEM: ['t', 'j', 'g', '179', '19', '305']

SOLUTION:
0, 1, 3, 5, 7, 9