Q: 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.
['g', 'g', 'r', 'g', 'b', 'z', '441', 'z', 'f', '35', 'x', '327', 'l', 'n']
A:
1, 2, 3, 4, 5, 7