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: ['z', 'n', '5967', 'b', 'l', 'v', 'l', '2641', '2375', 'w', '3289', '1531', 'e', '6509', 't', 'o', '3811', '6825', '5899', 'n', 'd', 'o', '8815', 'q', 'c', '4711', '5893', 'b', '1705', 'c', '8881', '9537', '6297', '981', 't', '5411', '5865', 'x', '8013', '1483', '5803', '7791', '5987', 'j']
Solution:
b, c, d, e, j, l, n, o, q, t, v, w, x, z