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: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

Output: g, i, l, m, o, r, s, y


Input: Consider Input: ['459', '1729', 'b', 'c', '9619', '4461', '4347', '6733', 'i', '3631', 's', 'j', 'i', 'r', '5293', 'q', '7397', '4309', 'c', 'n', 'k', '197', 'q', '8139']

Output: b, c, i, j, k, n, q, r, s


Input: Consider Input: ['y', '6669', 'v', '9459', 'o', 'j', 'h', '7693', 'd', '9543', 'w', 'i', 'e', '341', '7557', 'i', '69', '9089', 'g', 'j', 's', 'l', 'j', 'y', 'm', '1655', 'q', 'o', '601', 'g', '7281']


Output: d, e, g, h, i, j, l, m, o, q, s, v, w, y