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: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']
Example Output: h, m, p, w, y

Example Input: ['n', 'q', '6461', 's', '8565', '2237', '2071', '8143', '2977', '5511', 'j', 'o', '5793', 'j', 'm', 'n', '8031', 'j', '535', '5001', 's', 'y', '1737']
Example Output: j, m, n, o, q, s, y

Example Input: ['663', 'k', 'i', '7041', 'v', 'y', '7627', '7743', '1055', 'u', 'v', 'r', 'q', '7267', 'q', 'y', '5671', '7339', '5245', '5443', '9477', 't', '1665', 'a', 'o', 'z', 'p', 'a', '4673', 'y', '585', 'w', 'k', 'q', 'q', '5851', '4977', 'g']
Example Output:
a, g, i, k, o, p, q, r, t, u, v, w, y, z