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

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

PROBLEM: ['257', '111', 'g', '277', '473', '105', 'x', '217']

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

PROBLEM: ['x', '15', '43', 'm', 'u', 'u', '359']

SOLUTION:
1, 3, 4, 5, 9