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: ['3947', '4809', 'b', 'a', '4769', '4179', '535', '5965', 'f', 'j', '2265', 'w', '3103', 'u']

Output: a, b, f, j, u, w


Input: Consider Input: ['n', '9571', '2983', '7597', 'v', 'y', '1993', '1403', '8309', '7043', 'c', '7329', 'p', '4479', 'p']

Output: c, n, p, v, y


Input: Consider Input: ['x', 'w', 'h', 'r', 'a', '7263', 'r', '2989', 'c', '2707', '7841', 'i', 'z', 't', '7297', '8333', 'm', '5253', 'g', '2249', 'q', '9023', 'r', '3899', 'v', 'a', '1413', '6915', '3051', 'w', 'r']


Output: a, c, g, h, i, m, q, r, t, v, w, x, z