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: ['d', '771', '4193', 'e', '1537', 'a', 'q']

Output: a, d, e, q


Input: Consider Input: ['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']

Output: b, d, f, j, k, n, o, q, r, u, z


Input: Consider Input: ['c', '6203', '6203', '2133', '2117', '7841', '9209', '2249', 'w', '5095', 'p', 'k', 'd', 'o', '2561', '4963', '845', 'g', '7921', '7235', 'd', '5785', 'v', 'c', 'm', 'p', '3093', '6081', '3637']


Output: c, d, g, k, m, o, p, v, w