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: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']

Output: e, f, j, n, p, r, w, z


Input: Consider Input: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']

Output: e, f, l, n, p, q, r, s, w, y


Input: Consider Input: ['8139', '2895', '3075', '5033', '6355', '2381', 'h', '111', '4267', '2521', 'h', 'k', 'm', 'y', 'v', '4941', '3345', 'a', 'z', 'y', 'h', 'o', '9211', 'k', '2145', '5777', '7915', 'e', 'k', 't', '661', 'z', '4655', 's', 'g', '5353']


Output: a, e, g, h, k, m, o, s, t, v, y, z