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: ['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
Example Output: a, b, c, i, k, l, m, p, q, s, u, x

Example Input: ['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
Example Output: d, g, h, k, l, m, n, q, t

Example Input: ['6773', 'c', 't', '1937', '655', '5447', 'o', '6577', '701', '4701', '7299', 'l', '3755', 'g', '6719', 'q', '3027', 'g', 'n', 't', '3525']
Example Output:
c, g, l, n, o, q, t