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: ['285', 'w', '37', '471', 'y', '435', '27', '415', 'f', 's', '27', 'b']

SOLUTION: 1, 2, 3, 4, 5, 7, 8

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

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

PROBLEM: ['f', 'u', 'n', 'u', '479', '413', 'r', 'z', '107', 'w', '491']

SOLUTION:
0, 1, 3, 4, 7, 9