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: ['c', '8389', 'j', '6113', '5843', 'f']
Example Output: c, f, j

Example Input: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
Example Output: f, r, w, y

Example Input: ['p', '1271', '3061', '3955', '2411', 'f', '7229', '8911', 'i', '8341', 'g', 'b', '8963', 'z', 'w', 'x', 'y', '6423', 'n', '6507', 'j', 'k', 'p', '7491', '4877', 'v', 'u', '4929', '2511', '3331', 'f', '6899', '8799']
Example Output:
b, f, g, i, j, k, n, p, u, v, w, x, y, z