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: ['k', 'z', '303', 'a', 'f', 'q', 'i', '1475', '3453', 'd', 'w', '4037', 'z', 'h', 'k', '3547', '1561']
Example Output: a, d, f, h, i, k, q, w, z

Example Input: ['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']
Example Output: a, d, e, j, k, p, t, u, w, x, y

Example Input: ['2757', '6309', 'm', 'x', '289', 't', 'n', 'j', 'y', '5131', '4811', '387', '7151', '5725', 'k', 'g', 't', 'p', '4955', 'm', '9175']
Example Output:
g, j, k, m, n, p, t, x, y