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

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


Question: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']

Answer: a, h, m, n, p, s, v, w, y


Question: ['3793', '5963', '103', 'w', 'j', 'y', '6221', '861', '2027', '9883', 'y', 'o', '855', '6093', 'v', '9435', 'n', '2757', 's', 'u', '7551', '7041', '2823', 'y', 'e', '863', 'g', '7215', 'b', '4113', '9787', '8527', '753', 'k', 'm', 'j', 'g', '4773', '5507', 'h', 'z']

Answer:
b, e, g, h, j, k, m, n, o, s, u, v, w, y, z