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', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']
Example Output: a, c, e, h, i, o, p, s, u, w, x, z

Example Input: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']
Example Output: b, j, o, t, v, w

Example Input: ['5951', '569', '3919', 'w', 'q', 'v', 'b', '6263', '9767', 'c', '4221', 'e', 'j', 'i', '4985', '1223', 'h', 'y', '5015', 'q']
Example Output:
b, c, e, h, i, j, q, v, w, y