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: ['455', '447', 'x', '479', 'b', '267', '339', '29', '267']

SOLUTION: 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['c', '155', '61']

SOLUTION: 1, 5, 6

PROBLEM: ['49', 'd', '335', '133', 'y', '187', 'd', 'd', 'o']

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