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: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Answer: c, d, g, i, j, k, n, o, q, r, s, t, y, z


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: ['v', '9663', 'g', 'w', '1043', '1123', '6135', '3895', 'q', '1773', '7529', 't', '2361', '3091', 'f', 'p', 't', '7431', 't', '2467', 'e', '4229', 'l', '2617', 'v', 'k', 's', '1609', 'u', '9431', 'c', '5249', 'b', 'h', 'e', 'w', '4889', 'a', 'u', 'l', 'm', 'o', '9531', '4199', 'e']

Answer:
a, b, c, e, f, g, h, k, l, m, o, p, q, s, t, u, v, w