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.

Example Input: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']
Example Output: a, c, i, j, n, r, t, v, x

Example Input: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']
Example Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z

Example Input: ['8141', '6789', '3937', '7041', '7075', '2309', '6325', '6947', 'e', 'y', '8991', 't', 'n', 'a', 'n', 'a', '5591', '9573', 'i', '2887', 'f', '9793', 'q', 'i']
Example Output:
a, e, f, i, n, q, t, y