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.
Input: ['y', 'y', '399', '49', '469', 's', '179', 'm', '433', 'z', '355', '471']

1, 3, 4, 5, 6, 7, 9