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: ['d', '6003', 'k', '1987', '1877', 'a', '2615', 'n', 's', 'f', 'b', 'm', '1149', '8293', '5803', 'e', '2697', '5917', 'p', '6035', '2385', 'i', 'u', 'm', '9565', '4523', 'b', 'v', '2577', '9725', '6093', '6203', '4197', '8477', 'o', 'd', '3637', '9827', '5523', '7189', 'j', '8893', 'h', 'q']

Answer: a, b, d, e, f, h, i, j, k, m, n, o, p, q, s, u, v


Question: ['e', 'z', '5199', 'x']

Answer: e, x, z


Question: ['z', 'w', 'm', 'g', '2545', 'a', '2677', 'p', 'r', '523', '8087', 'l', '1301', '9911', '3159', '8279', '8923', '825', '8709', '939', 'l', '8499', '3975', 'j', '8927']

Answer:
a, g, j, l, m, p, r, w, z