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: ['v', 'j', 'l', 'f', 'n', '185', 'x', '367']

SOLUTION: 1, 3, 5, 6, 7, 8

PROBLEM: ['q', 'u', '199', 'v', '249']

SOLUTION: 1, 2, 4, 9

PROBLEM: ['195', '187', '333', '363', '9']

SOLUTION:
1, 3, 5, 6, 7, 8, 9