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: ['c', 'r', 'i', 'f', '113', '2325', 'v', '5693', 'j', '4267', '1575', '7855', '5021', '1009', '8423', 'e', 'm', 'b', 'p', 'x', 'r', '9831', '2519', '9437', '7485', '2999', 'w', 'w', 'q', 't', 'x', '8583', '7027', '6209', '1823']
Solution:
b, c, e, f, i, j, m, p, q, r, t, v, w, x