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: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']

Output: b, e, f, i, k, l, m, o, p, q, r, t, v, w, y


Input: Consider Input: ['5089', '6113', 'v', 'l', '5529', 'q', '7499', 'e', 'r', 'c', '5999', '2619', 'a', '2523', '7697', 'j', 'c', '6537', '8313', '5623', '4225', '7677', 'q', 'a', '6559', 'y', 'b', 'm', '7645', '7019', 'r', 'i', '5225', '703', 'i', '6189', 'f', 't', '7553']

Output: a, b, c, e, f, i, j, l, m, q, r, t, v, y


Input: Consider Input: ['z', '3643', 'f', 's', '2307', '3601', '2831', '1205', '1663', '1539', 'r', 'n', '5837', '2545', 'p', '7837', '6321', '8153', 'i', '7849', 'p', 's', '3157', '3497']


Output: f, i, n, p, r, s, z