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: ['o', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']
Example Output: c, e, f, m, o

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: ['b', '9987', 'g', 't', '9191', '8299', '2355', 'u', '8203', 'o', 'l', '9247', '5283', '3111', '3929', 'k', '3899', 'f', '9407', 't', '2159', 'r']
Example Output:
b, f, g, k, l, o, r, t, u