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: ['41', 'o', 'm', 'h', 's', 't', '407', '445', '371', '93', '291', '457', 'r', '391', 'a']

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

PROBLEM: ['69', '307', 'l', 'j', '167', 'o', '427', 'j']

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

PROBLEM: ['y', '67', 'f', 'n', '377', '71', '419', 'i', 'z', 'g', 'n']

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