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: ['239', '439']

SOLUTION: 2, 3, 4, 9

PROBLEM: ['103', '355', '417', 'e', '359', 'c', 'w', 'q', '237', '93', '431', '59', 'l', '121']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['233', 'm', '195', 'h', '111', '485', 'w', '33', '11', 'a', 'm', 't', 'm', '421']

SOLUTION:
1, 2, 3, 4, 5, 8, 9