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.

Input: Consider Input: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']

Output: c, i, m, n, p, z


Input: Consider Input: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']

Output: c, g, j, m, q, r, s, w


Input: Consider Input: ['h', '7977', 'x', '8119', '4483', '7595', '1009', '7157', 't', 'f', '2321', 'q', 't', 'g', '3897', '7289', '1365', 'i', '3403', 'o', '4623', 'n', '6565', '2487']


Output: f, g, h, i, n, o, q, t, x