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: ['9657', 's', '537', 'j', '3513', 'z', 'q', '187', 'm', 'o', 'v', '4157', 'w', 'n', '227', '3527', '3745', 't', 'i', '7689', '9355', 'f', 'd', '5581', '3039', '4121', '2141', '2491', '3731', 'f', 'p', 'k']
Solution:
d, f, i, j, k, m, n, o, p, q, s, t, v, w, z