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: ['j', 'w', 'h', 'r', 'w', 'h', 'd', 'f', '81', 'g', '145']

SOLUTION: 1, 4, 5, 8

PROBLEM: ['203', 'p', 'r', 'r', 'c', 'w', 'z', 'w', 'a', '203', 'n']

SOLUTION: 0, 2, 3

PROBLEM: ['v', 'w', 'e', 'a', '3']

SOLUTION:
3