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: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']
Example Output: g, i, k, l, m, n, o, p, t, u, w, y

Example Input: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
Example Output: a, j, l, q, y, z

Example Input: ['7675', 'e', '2093', 'x', '2577', '6827', 'u', 'a', '5709', '8223', 's', '3219', '6419', 'p', 'm', 'j', '4459', 'l', 'x', '4705', 'x', 'o', '2779', 'g', '9515', '3813', '679', '8119', 'a', 'm', 'k', '6391', 'x', 'x', '7267', 'n', '1387', 'v', '5503', '3803', 'b', '5915', 'q']
Example Output:
a, b, e, g, j, k, l, m, n, o, p, q, s, u, v, x