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: ['q', 'q', 'p', '2071', '9501', '8641', 'i', 'o', '7721', '5091', '2275', 'd', 'g', '5443', 'r', 'c', '3705', '3831', 'c', 'h', 'c', '9981', '9945', 'o', 'o', 'i', '7021']
Example Output:
c, d, g, h, i, o, p, q, r