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: ['7109', '1243', 'f', 'z', 'h', 'd', '6169', 'v', 'h', '3609', '3181', 'd', '3661', '7193', '7341', '9127', 'r', '1623', '5813', 's', 'd', '4011', '4983', 'n', '4195']

Answer: d, f, h, n, r, s, v, z


Question: ['c', '4481', '5035', 'x', 'z', '9035', '2641', 'b', '591', 'n', '6045', '9117', '4731', '807', '7069', 'd', '1735', '6971', '4823', 'j', 'v', '63', 'u', 'x', '4925', 'c', 'b', '7089', 'w', 'm', 'q', 'r', '5287', 'c', '4443', 'd', 'g', '8943', '2367', 'h', '3391', 'd', 'w', 'c', 'b']

Answer:
b, c, d, g, h, j, m, n, q, r, u, v, w, x, z