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: ['357', '269', '105', '315', 'c', '301', 'v', '441', '415', 't', 'a', 'o', 'u', '23', 'n']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['n', 'j', 'y', '455', 'x', 'v', 'f', '3', 'a', '125', '321', 'g', 'c', 'h', '335']

SOLUTION:
1, 2, 3, 4, 5