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: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
Example Output: c, f, j, k, o, y

Example Input: ['7055', '2573', '1713', 'x', 'm']
Example Output: m, x

Example Input: ['4341', '8815', '7365', 'h', '7311', '8991', '8963', 'n', 'z', '8805', 'o', 'v', 'a', 'q', 'i', '7971', 'a', '217', 'f', 'k', '5731', 'n', 'z', '5803', '5523', 'u', 'r', 'n', 'b']
Example Output:
a, b, f, h, i, k, n, o, q, r, u, v, z