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: ['493', '241', '239', 'g', 'q', '319', '49', '245']

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

PROBLEM: ['z', '209']

SOLUTION: 0, 2, 9

PROBLEM: ['203', 'f', '255', '101', '217']

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