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.

Example Input: ['i', '9575', '8995', 'm', 'o', '3015', '4005', '6909', '7195', '3361', 'j', '5253', '9523', '8879', '5861', 'e', 'y', 'e', '1525', 'i', '807', '8469', '3333', '4017', '2237', '3387', 'o', '643', 'p', '7129', '6243', 'y', '4913', 'z', 'f', '6909', 'f', '4347', '7227', 'o', 's', '9909', '8611']
Example Output: e, f, i, j, m, o, p, s, y, z

Example Input: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']
Example Output: a, c, h, i, j, k, r, s, u

Example Input: ['e', '3027', '4463', 'q', 'w', 'w', 'm', '5897', '371', '687', '5275', '2523', '9191', '2403', 'n', 'd', '6955', 'l', 'e', '4343', 'r', '6487', '7531']
Example Output:
d, e, l, m, n, q, r, w