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: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']
Example Output: a, d, g, w

Example Input: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']
Example Output: a, c, h, i, j, k, r, s, u

Example Input: ['9389', '8739', 'n', '435', 'w', 'h', 'a', 'r', 'd', 'm', 'q', '8685', '2393', 'e', 'j', 'x']
Example Output:
a, d, e, h, j, m, n, q, r, w, x