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: ['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']

Answer: a, b, e, f, g, h, i, j, k, n, p, r, u, y


Question: ['o', '1099', 'r', '8995', 'o', '2909']

Answer: o, r


Question: ['2575', 'i', 'j', '8077', 'd', 'q', 'p']

Answer:
d, i, j, p, q