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: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']

Output: b, v, y


Input: Consider Input: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']

Output: b, d, i, p, r, t, u, v, w, y, z


Input: Consider Input: ['k', 'y', '149', '399', 'y', 'm', '3569', 'y', 'v', 'i', '9305', '4859', '889', '9101', '579', 'm', 'k', '9111', '6251', '8381', 'z', '1049', '29', 'i', '3003', 'g', 'm', 'w', 'q', '1585', '7579', '7247', '3489', '6853', '9563', '1', '9781', '5677', 'z', 'o', '2933', 'u', 'u', 'g', 'z']


Output: g, i, k, m, o, q, u, v, w, y, z