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: ['d', '207', 'k', '4499', 'o', '4597', 't', '5561', 'c', 'q', '4097', '6657', '455', '7123', '2735', '7091', 'j', 'e', 't', '167', '2777', '5307', 'f', '6531', 'y', '5321', 'v', 's', 'q', '7203', '3907', 'w', '2823']
Solution:
c, d, e, f, j, k, o, q, s, t, v, w, y