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: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
Example Output: a, d, h, i, j, m, n, p, y

Example Input: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
Example Output: c, i, m, v

Example Input: ['b', '477', '9153', '3853', 'f', '8191', '1519', '397', '4703', 'z', 'e', '8135', '6537', '7469', 'o', '1393', 'x', '8883', 'r', '1075', '1029', 'b', 'e', '7583', 'u', 'i', 'p', 'm', 'y', 'v', '6639', '769', 'a', '1179', 'u', 'b', '6957', 'l', '7101', 'q']
Example Output:
a, b, e, f, i, l, m, o, p, q, r, u, v, x, y, z