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: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
Example Output: e, k, m, p

Example Input: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']
Example Output: a, j, r, z

Example Input: ['n', 't', 'r', 'v', 'c', 'w', 'e', '6557', 'm', '1291', 'g', '5853', 'q', '5449', '6115', 'l', '779', 'b', 'e', 'l', 'i', '7919', '7805', '2773', '2265', 'c', 'e']
Example Output:
b, c, e, g, i, l, m, n, q, r, t, v, w