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: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']

Output: b, d, f, i, j, k, n, s, t, w, x, y


Input: Consider Input: ['k', 'r', 'f', '4369', 'z', 'z', 'l', '143', 'r', '707', '9167', 'g', '1749', 'i']

Output: f, g, i, k, l, r, z


Input: Consider Input: ['s', '3501', 'v', '6037', 'h', '5963', 'j', 'p', 'k', '9833', 'm', '3793', '4017', 'r', '6403', 'q', 'c', '6403', 'c', '2681', '2393', 'u', 'c', '455', 't', 'w', 'o', 'u', 'i']


Output: c, h, i, j, k, m, o, p, q, r, s, t, u, v, w