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: ['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']

Answer: a, b, e, h, l, q, s, y, z


Question: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']

Answer: d, f, j, r, t, z


Question: ['w', 'k', 'e']

Answer:
e, k, w