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: ['t', '103', '349', '203', 'b', 'z', 'i', '337', 'y', '137', '77', 'p', 'k']

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

PROBLEM: ['d', '335', '23', '461', '497', 'p', '313']

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

PROBLEM: ['355', 'a', '183', 'f', 'w', 'c', '69', 'p', 'h', 'm', '371', '355', 'o', 'n']

SOLUTION:
1, 3, 5, 6, 7, 8, 9