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: ['1881', 'j', '651', '8803', '5869', '1005', 'k', '475', '6423', '761', '4417', '3421', 'j', 'q', 'a', 't', 'k', 'k', 'u', 'r', '4905', 'm', '5375', 'w', 'o', 't', '7095', 'j', 'h', 'o', '2097', '5905', 's', '61', '3231', 'd']
Solution:
a, d, h, j, k, m, o, q, r, s, t, u, w