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: ['497', '21', '239', '487', '149', 'q']

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

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

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

PROBLEM: ['315', 'd', 'o', 'j', 'j', 'a', '267', '447', 'h', 's', '421']

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