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: ['8739', 'v', 'm', '6277', 'l', 's', '109', '8057', '3835', 'd', 'u', 'f', 'w', 'd', 'p', '7705', '3643', '4455', 'u', 'p', 'u', '9407', 'g', 'w', '595', 'z', '6827', '6879', 'w', 'w', '6973', 'm', 'e', '1553', 'v', '3529', '8953', '3903', '5713', '8249', 'e', '1113', 'b', 't', 'r']
Example Output: b, d, e, f, g, l, m, p, r, s, t, u, v, w, z

Example Input: ['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
Example Output: a, b, c, i, k, l, m, p, q, s, u, x

Example Input: ['x', 'z', '131', 'i', 'h', '2695', '2337', 'b', '5153', 'x', '9443', 'f', '1131', 'f', '6089', 'k', 'g', 'f', '3917', '143', 'g', 'q', '6697', '5163', '6013']
Example Output:
b, f, g, h, i, k, q, x, z