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.
--------
Question: ['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']

Answer: d, f, h, i, j, l, m, q, u, v, x


Question: ['2393', 'c', '4413', '5529', '1487', '2499', 'i', 's', 'i', '8575', 'm', 'z', '7179', '6637', '9181', 'z', 'h', '2487', 'i', '3779', '2017', '5217', '5013']

Answer: c, h, i, m, s, z


Question: ['9233', '2737', 'g', '7399', '5917', 'z', '3389', '9791', '6001', 'k', '1703', '9733', '65', '3737', '3881', '1581', 'v', 'o', 'b', 'i', '3535', '1889', '1779', '6189', '8541', 't', 'm', 'q', 's', 'w', 'j']

Answer:
b, g, i, j, k, m, o, q, s, t, v, w, z