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: ['353', '195', '297', '175', 'u', 'p', 'r', 'l']

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

PROBLEM: ['x', '91', 'q', '417', '385', '455', '393', 'm', 's', 'c', '91', '71', 'n']

SOLUTION: 1, 3, 4, 5, 7, 8, 9

PROBLEM: ['m', 'c', 'y', '339']

SOLUTION:
3, 9