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: ['459', 'd', '473', 'i', 'l', 's']

SOLUTION: 3, 4, 5, 7, 9

PROBLEM: ['x', '325', 'i', 'n', 'i', 'w', 't']

SOLUTION: 2, 3, 5

PROBLEM: ['13', '313', '117']

SOLUTION:
1, 3, 7