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.

Input: Consider Input: ['n', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']

Output: h, i, k, m, n, o, w, x, y


Input: Consider Input: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']

Output: e, g, h, k, l, m, r, s, y, z


Input: Consider Input: ['6715', 'm', 'x', 'u', '907', 'l', 'q', 'j', 'l', '6507', '869', '2135', 'q', '6505', '1945', 'q', '6539', '8341', 'l', 'k', '4613', 'h', 'x', 'v', 'q', '9837', '6363', '5279', '77', 'k', '9295', 'h', '3329', '6429']


Output: h, j, k, l, m, q, u, v, x