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: ['379', 'w', 'b', '385', '429', '3', '297', '297', 't', 'z', 'i', '207', 'e', 'a']

SOLUTION: 0, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['425', 'a', '351', 'v']

SOLUTION: 1, 2, 3, 4, 5

PROBLEM: ['m', '259', 'p']

SOLUTION:
2, 5, 9