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: ['295', 'd', 's', '1', '201', 'n', 'f', '15', '151', '307', 'b', '103', '255']

SOLUTION: 0, 1, 2, 3, 5, 7, 9

PROBLEM: ['h', '281', 'x', '471']

SOLUTION: 1, 2, 4, 7, 8

PROBLEM: ['s', '1', '339', 'y', '453', '287']

SOLUTION:
1, 2, 3, 4, 5, 7, 8, 9