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: ['k', '409', '333', '283', 'm', '489', '377', '439', '443', 'r', '101', 'n', '35']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['13', 'p', '427', 's', 'x', 'x', '43', 'h', 'j', 'z', '21']

SOLUTION: 1, 2, 3, 4, 7

PROBLEM: ['349', 'k', '473', '143', 'd', 'm', 'i', '181', 'd']

SOLUTION:
1, 3, 4, 7, 8, 9