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: ['473', '357', 'i', 'j', '299', 's', '495', '165', 'o', 'l', 'x', 'v', '1', 'o', '469']

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

PROBLEM: ['j', 't']

SOLUTION: -1

PROBLEM: ['245', '385', 'e', 'l', 'x', '55']

SOLUTION:
2, 3, 4, 5, 8