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: ['1945', 't', '4477', '4439', '6569', '2021', 'y', 't', '2725', '8947', '6921', '1373', '8107', 'g', 'c', 'w', 'x', 'b', '9117', 'k', '6567', '5073', '2307', 'e', 'b', '7405', 'e', 'x', '1419', 'd', 'o', 'n', 'a', '2647', 'z', '1459', 'n', '6137', 'u', 'b', 'q', '4459']
Example Output: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z

Example Input: ['o', 'm', '6211', '2067', 's', 'n', 'a', '5643', '3431', 'h', 't', 'w', '1067', '2659', '9383', '4009', '5645', '327', '3753', '9589', 'c', '469', 'w', '1773', 'e', 'y', 'g', 'b', 'g']
Example Output:
a, b, c, e, g, h, m, n, o, s, t, w, y