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', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']

Output: a, d, h, i, j, m, n, p, y


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: ['y', '3345', 'l', '2479', 'y', '4325', 'h', 'l', '7911', 'b', 'r', '4385', 'a', '2905', '2969', 'q', 'j', 'p', '915']


Output: a, b, h, j, l, p, q, r, y