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: ['129', '373', '461', 'h', 'r', '163', '361', '483', '463', 'e', 'z', 'l']

SOLUTION: 1, 2, 3, 4, 6, 7, 8, 9

PROBLEM: ['h', 'l', '43', 'b', 'g', '265', '355', 'y']

SOLUTION: 2, 3, 4, 5, 6

PROBLEM: ['279', '413', 'e', '311', '355', '133', '451', 'e', '5', '311', '59', '235', 'l', '491']

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