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: ['c', '471', 'l', 'z', '23', 'c', '43', 'o', '175', 'w', 'c', 'p', '431']

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

PROBLEM: ['255', '177', 'u', '25', '363', '155', 'v', 's', 'm', 'j']

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