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: ['s', 'u']

Output: s, u


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: ['9965', '5681', '5831', '6161', '1157', '1707', '5187', '9765', '3791', 'g', '6087', '3189', '9949', '5517', 'h', 'y', '2795', '5983', 'j', '5119', '1571', 'g', '1327', 'd']


Output: d, g, h, j, y