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: ['c', 'e', '6509', '1295', 'u', '5445', '1731', '3049']

Output: c, e, u


Input: Consider Input: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']

Output: c, d, e, f, l, n, p, q, t, u, v, y


Input: Consider Input: ['1105', '9119', 'e', 'w', 'f', 'k', '5623', 'i', 'c', '7909', '3705', 'l', 'b', 'r', '8169', '9753', 'x', '1125', '9769', '8965', '7181', '4653', '1005', 'k', '9357', 'i', 'w', '3965', '2675', '2093', '6349', 'l', 'e', '8319', '3907', 'k', 'g', 's', 'e', 's', '3763', '2687', 'd', 'k']


Output: b, c, d, e, f, g, i, k, l, r, s, w, x