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: ['69', '307', 'l', 'j', '167', 'o', '427', 'j']

SOLUTION: 0, 1, 2, 3, 4, 6, 7, 9

PROBLEM: ['j', '195', 'u', '55']

SOLUTION: 1, 5, 9

PROBLEM: ['v', 'i', '249', '13', '495', 'f', 'r', 'h', '43', '37']

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