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: ['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

Output: a, b, d, e, j, k, m, n, o, p, q, u, v, w, x


Input: Consider Input: ['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']

Output: a, c, d, f, g, j, k, l, m, o, q, u, w, y


Input: Consider Input: ['4123', '7729', '2635', '4773', '3083', 'w', '393', 'a', 't', 'f', '7615', '9643', '4745', '7743', 'r', '1569', 'z', 'b', 'd', '1335', 'k', '8653']


Output: a, b, d, f, k, r, t, w, z