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: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']

Answer: a, b, e, h, j, k, n, o, t, u, v, y


Question: ['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']

Answer: d, f, h, i, j, l, m, q, u, v, x


Question: ['3667', 'i', 'i', '123', '5243', 'y', 'b', '2657', '6731', 'q', 'r', 'b', '2459', '3765', '3597', '2751', '3403', 'o', 'k', 'g', '3909', 'p', 'r', '4833', '2645', 'm', '1935', 'b', '8199', 'p', 'd', '9447', 's', 'r', 'd', '3067', 'i', '3417', '5027', '7127', '2505', 't', '247']

Answer:
b, d, g, i, k, m, o, p, q, r, s, t, y