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: ['109', 'b']

SOLUTION: 0, 1, 9

PROBLEM: ['157', '481', 'n', 't', 'd', 'j']

SOLUTION: 1, 4, 5, 7, 8

PROBLEM: ['t', 't']

SOLUTION:
-1