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: ['p', '2923', 'e', 'k', '5433', '605', '5079', 'k', 'p', 'x', '4845', '4099', '6795']
Example Output: e, k, p, x

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: ['y', 'g', 'c', 't', 'o', 'k', 'j', 'k', '5567', 'c', 'm', 'u', '4517', 'r', '7277', '3145', '3279', 'k', 'h', '2745', '5141', 'o', 'o', '5257', '705', 'r', 'f', '4891', '765', 'm', 'v', 'n', 'w', 't', 'u']
Example Output:
c, f, g, h, j, k, m, n, o, r, t, u, v, w, y