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: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']

Output: b, l, r, v, y


Input: Consider Input: ['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']

Output: a, b, g, h, j, m, p, q, s, t, u, v, w, y, z


Input: Consider Input: ['3871', '8695', 'd', '4169', 'v', '5793', '6131', 'f', '3705', '3103', 'k', '2409', '483', '5809', 'u', '715', 'x', '5371', 'p', '6437', '349', 'z', 'b', '951', 'y', '9975', 'm', '1671', '6123', 'r', '1995', 'q', '9431', 'd', '1851', '7933', 'g', '9085', '8803', 'm', '6707', 'p', 'd', '1365']


Output: b, d, f, g, k, m, p, q, r, u, v, x, y, z