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.

Example Input: ['9579', 'm', 'v', 'r']
Example Output: m, r, v

Example Input: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
Example Output: c, d, k

Example Input: ['4843', '1403', '9983', '9043', 'z', 'f', 'q', '8721', '6567', 'r', 'n', 'n', 'v', '6509', '3', 'k', 'c', '5725', 'w', 'r', '1483', '8209', 'a', 'y', 'w', '9927', 'x', 'n', 'x', '1225', '7453', 'g', 'n', 'm', '7607', '7459', 'r', '3855', '5753', 't', 'y', '9159', 'z', '6553', 'c']
Example Output:
a, c, f, g, k, m, n, q, r, t, v, w, x, y, z