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: ['243', 't', '249', 'q', '459', '469', '301', 'j', '215', '21']

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

PROBLEM: ['415', '365', '373', 't', 'n']

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

PROBLEM: ['t', 'u', '199', 't', '127', '165', 't', '227', 'y', 'o', '227']

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

