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: ['y', 'b', 'r', 'f', '3745', 'n', '2921', '8133', 'r']

Output: b, f, n, r, y


Input: Consider Input: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']

Output: d, e, k, q, s, u, w


Input: Consider Input: ['5023', 'y', '3981', 'n', '489', 'j', '3435', '2357', '5035', '3751', '6277', '2027', '1177', 'b', 'g', 'c', '9459', 'a', 'y', 't', '2341', 'f', '5335', 'c', '4343', '3147', '8695', '9423', 'z', 'b', 'a', '7201', 'j', '425', '9389']


Output: a, b, c, f, g, j, n, t, y, z