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: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
Example Output: e, f, g, h, k, q, u, z

Example Input: ['2943', 'k', '8519', '9103', 'j', '2461', '1049', '2211', '8761', 'l', 'e', '8939', '6013', 'r', '9089', '5781', '5383', '5495', '6699', '7307', '2733', '933', '9865', 'g', '6471', '3179', 'm', '8231', 't', 'e', 'u', '9909', 'g', 'g', '9431', '6521', 'y', 'g', '1415', 'e']
Example Output: e, g, j, k, l, m, r, t, u, y

Example Input: ['2843', '1825', 'q', '1891', '1743', 'n', 'u', '9537', 'n', '4409', '759', '5807', 'g', 'n', '4159', 'b', '9091', 'q', 'k', 't', 'd', 'r', 'y', 'g', 'v', 'y', '7399', '1013', '203', 'q', 'h', 'f', '4955', 'h', '7297', 'w', 'b', '7765', 'y', 'g', 'l', 'y']
Example Output:
b, d, f, g, h, k, l, n, q, r, t, u, v, w, y