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: ['173', 'r', 'a', 'n', 'h', 'o', 'w', '135', '321', '59', 'r', '295', 'r']

SOLUTION: 1, 2, 3, 5, 7, 9

PROBLEM: ['493', '441', '3', 'p', '23', 'x', 'n', '417', '299', 'v', 'l', '415']

SOLUTION: 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['z', '259']

SOLUTION:
2, 5, 9