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: ['j', 'k']

SOLUTION: -1

PROBLEM: ['h', '477', 'w', '315', 'k', 'd', '367', '411', '207', 'b', '81', 'k', 'f', '107', '103']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8

PROBLEM: ['r', 't', 'z', '169', 's', 'f', 'd', 'e']

SOLUTION:
1, 6, 9