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: ['333', '207', '13', '339', 'n', '387']

SOLUTION: 0, 1, 2, 3, 7, 8, 9

PROBLEM: ['235', '17', 'g', '125', '455', 'h', 'u', 'u', 'y', '219', '129', 'q', 'u', 'r']

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

PROBLEM: ['p', '171', '489', 'l', '421', '275']

SOLUTION:
1, 2, 4, 5, 7, 8, 9