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', '4481', '5035', 'x', 'z', '9035', '2641', 'b', '591', 'n', '6045', '9117', '4731', '807', '7069', 'd', '1735', '6971', '4823', 'j', 'v', '63', 'u', 'x', '4925', 'c', 'b', '7089', 'w', 'm', 'q', 'r', '5287', 'c', '4443', 'd', 'g', '8943', '2367', 'h', '3391', 'd', 'w', 'c', 'b']
Solution:
b, c, d, g, h, j, m, n, q, r, u, v, w, x, z