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: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']

Output: e, g, h, i, p, r, y


Input: Consider Input: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']

Output: a, d, h, k, o, p, r, t, x


Input: Consider Input: ['9359', '899', '249', '7853', '317', 't', '5875', '947', 'm', '697', '3751', 'z', 'h', 'p', 'v', '8717', '9797', 'o', '7885', '4687', '9841', '8237', 'c', 'w', '7517', '7073', 'g', '7433', 'e', '4585', 'c', 'c', 'p', 't', 'k', '8587']


Output: c, e, g, h, k, m, o, p, t, v, w, z