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: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
Example Output: b, d, i, j, r

Example Input: ['7911', '7175', 'y', '9173', 'y', '2529', '831', 'k', '7197', 'j', '2343', 'i', 'b', '6799', '5987', '7277', 'n', 'x', 'h', '7209', 'l', 'd', 'm', 'e', '2277', '8909', 'x', '5361']
Example Output: b, d, e, h, i, j, k, l, m, n, x, y

Example Input: ['8897', '6829', 'g', 'g', 'o', 'g', '8047', '9631', 'k', '7069', 'h', 'e', 'i', '7413', 'b', '8727', 'z', 'q', 'k', 'a', 'c', '2147', '8177', 'r', 't', '6719', '2353', '3531', 'm', '9179', 'w', '3347', '5433', 'l', '4111', '8915', 'n', 'g', '2825', '5315', 'q', 'b', '4833']
Example Output:
a, b, c, e, g, h, i, k, l, m, n, o, q, r, t, w, z