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: ['361', '47', 'k', '33']

SOLUTION: 1, 3, 4, 6, 7

PROBLEM: ['u', 'z', 'p', '99', 'b']

SOLUTION: 9

PROBLEM: ['s', '95', 'j', '173', '437', '143', 'n', '357', 'w', '239', '219']

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