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: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']

Answer: d, f, g, i, k, t, v, w


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: ['e', '5061', 'v', 'g', '8149', 'q', '4163', '3337', '2983', '3669', '4883', '4213', 'c']

Answer:
c, e, g, q, v