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: ['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']

Output: p, q, y


Input: Consider Input: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']

Output: a, b, d, e, g, h, o, r, u, v, w, y, z


Input: Consider Input: ['3825', 'i', 's', 't', '5841', 'p', '465', 'g', '1731', 'g', 'd', '4671', '5643', 't', '2551', 'g', 'e', 'x', 'y', 'g']


Output: d, e, g, i, p, s, t, x, y