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: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
Example Output: g, i, j, l, o, p, q, r, v

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: ['321', 'z', '5395', '6753', 'a', '4669', 'q', 'x', '4183', 'p', 'r', '9479', 't', '7983', 'c', 'n', '7043', '4925', 'y', 'm', '2947', 't', '1891', '3087', '3747', '4409', 'o', 'a']
Example Output:
a, c, m, n, o, p, q, r, t, x, y, z