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: ['187', '461', 'b']

SOLUTION: 1, 4, 6, 7, 8

PROBLEM: ['j', '131', 'e', 'c', '149', '325', 'h', 'l', 'i', 'q', '151']

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

PROBLEM: ['j', 'x', '47', '337', 'd', '333', '357']

SOLUTION:
3, 4, 5, 7