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: ['459', 'd', '473', 'i', 'l', 's']

SOLUTION: 3, 4, 5, 7, 9

PROBLEM: ['e', '307', '191', 'k', 'o', 'j', '99']

SOLUTION: 0, 1, 3, 7, 9

PROBLEM: ['55', '443', '377', 'm', '473', '143', 'r']

SOLUTION:
1, 3, 4, 5, 7