In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

Let me give you an example: ['8129', 'a', '4245', 'y', 'm', 'a']
The answer to this example can be: a, m, y
Here is why: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

OK. solve this:
['7155', 'b', 'o', 'd', '7543', '4707', 'y', 'd', '9883', '5675', '4225', '4489', '6755', 'o', '135', 'i', 'x', 'e', '1867', '9353', '6937', 'h', '7651', 'f', 'i', 'w', '5199', '3317', 's']
Answer:
b, d, e, f, h, i, o, s, w, x, y