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: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

Answer: g, i, l, m, o, r, s, y


Question: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']

Answer: f, i, k, n, q, r, s, w, y


Question: ['9627', 'o', 'h', '7577', '6881', 'e', 'h', 'n', 'n', 'h', 'u', 'x', 'z', '9581', 'z', 'o', 'j', '1399', 'b', 'r', '4797', '8073', '6803', '4991', 'v', 'h', '8185', '2521']

Answer:
b, e, h, j, n, o, r, u, v, x, z