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.
One example: ['8129', 'a', '4245', 'y', 'm', 'a']
Solution is here: a, m, y
Explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Now, solve this: ['2107', 'a', 'w', '7511', 'n', '9501', 'z', '5245', 'h', 'i', 'v', '8795', '9639', '2647', '6327', 'x', '607', 'e', 'b', 'y', '9561', '437', 'y', 'q', '3723', '1753', '1863', 'v', '1167', '7399', 'o', 'k', 'i', 'e']
Solution:
a, b, e, h, i, k, n, o, q, v, w, x, y, z