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: ['13', 'p', '427', 's', 'x', 'x', '43', 'h', 'j', 'z', '21']

SOLUTION: 1, 2, 3, 4, 7

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

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

PROBLEM: ['j', '319', 'u', '497', 'i', 'n']

SOLUTION:
1, 3, 4, 7, 9