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: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']

Output: e, g, h, k, l, m, r, s, y, z


Input: Consider Input: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']

Output: a, c, e, g, h, i, k, p, q, r, u, v, w


Input: Consider Input: ['v', '8573', '7567', 'm', 'a', '4143', '2239', '4233', 't', 'q', '1987', 'p', 'f', '8553', 'l', 'c', 'w', '8077', '5161', 'y', 'w', '8449', 'q', '6079', 'h', '9287', 't', '5467', 'i', '459']


Output: a, c, f, h, i, l, m, p, q, t, v, w, y