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: ['1707', '381', '3957', '7853', '4987']

Output: -1


Input: Consider Input: ['699', 'd', '6027', 'j', 'e', 'c', 't', '9983', '5471', '2649', 't', '2631', 'r', 'h', '293', 'j', '8699', 'p', 'k', '5433']

Output: c, d, e, h, j, k, p, r, t


Input: Consider Input: ['2585', 'i', 'o', 'k', '8649', 's', 'z', 'm', 'v', 'r', '3557', '7703', '951', '7947', 'x', 'b', '1623', '6565', '7073', '5115', 's', '1985', 'p', 'k', 'u', '3397', '8315', 'a', '5643', '6047', 'r', 'z', 'z', 'q', 'x']


Output: a, b, i, k, m, o, p, q, r, s, u, v, x, z