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: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']
Example Output: e, g, h, k, l, m, r, s, y, z

Example Input: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']
Example Output: a, b, d, f, j, k, m, r, t, u, w, x, z

Example Input: ['b', 'a', '1805', 'e', 'u', '5417', 'x', 'b', '3253', '4899', '5163', 'n', 'i', 'a', '3381', 'g', 't', '519', 'd', '5907', 'f', '381', 'u', 'n', 'e', '3903', '1805', '9841', 'z', '2459', '3701', '3113', 'v', 'z', 'i', 'g', 'j', '2533', 'n', '4361', '6853', 'u', '8373']
Example Output:
a, b, d, e, f, g, i, j, n, t, u, v, x, z