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: ['3743', 'l', '6819', 'o', '1445', '4457', '5283', '8207', 'k', '6123', 'y', '8917', 'n', '3495', '4355', 'i', '4797', 'f', '1047', '367', 'q', 'p', 'j', '6837', 'o', '1151', 'j', '3049', 'z']
Solution:
f, i, j, k, l, n, o, p, q, y, z