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: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Output: c, g, l, n, r, u, v, w, z


Input: Consider Input: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']

Output: d, e, k, q, s, u, w


Input: Consider Input: ['a', '6113', 'j', 'g', 'n', '227', 'p', 'p', '9739', 'n', 'n', 'w', '2869', '9925', 'h', 'q', 't', 'p', '1381']


Output: a, g, h, j, n, p, q, t, w