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: ['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: ['d', 'o', '7643', '9065']

Output: d, o


Input: Consider Input: ['d', 'l', '7241', 'j', 'q']


Output: d, j, l, q