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: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']

Answer: a, c, e, h, i, o, p, s, u, w, x, z


Question: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']

Answer: f, g, h, m, n, o, q, t, v, z


Question: ['u', '2749', 'p', '5635', 'l', '5799', 'j', '3059', '7433', 'x', '1863', 'e', 'a', 'd', 'y', '5195', '4135', 'c', '405', 'a', '3077', '1123', 'p', 'a', '9873', '5419', '9', '7087', 'h', '181', '9691', 'p', 'c', 'r', 'z', 'h', 'o', '301']

Answer:
a, c, d, e, h, j, l, o, p, r, u, x, y, z