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: ['117', '247', '49', '63']

SOLUTION: 1, 2, 3, 4, 6, 7, 9

PROBLEM: ['99', '245', 'c', '435', '255', 'v']

SOLUTION: 2, 3, 4, 5, 9

PROBLEM: ['l', 'v', '341', '269', '193', 'f', 's', '377', 'g', 'l', 'a', 'q', 'v', '63', 'e']

SOLUTION:
1, 2, 3, 4, 6, 7, 9