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: ['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']

Answer: d, e, j, l, n, p, q, s, t, w


Question: ['8311', 'w', 'f', '3431', '9863', '5817', '3969', '2705', 'x', 'm', 'k', 'z', 'z', '235', 'x', '417', 's', 'i', 'y', '8833', '8675', 's', 'm', '2149', '765', 'u', '1021', '7823', 'x', '7275', '3157', 'k']

Answer: f, i, k, m, s, u, w, x, y, z


Question: ['t', '7277', '9321', 'o', 'y', '3749', 'f', '9933', 'a', '105', 'o', 'b', 'q', '959', '4775', '2171', '3887', 'f', '9011', '8359', '6877', '8629', 'a', '7805', '6575', '7031', '7351', '571', 'e', '4957', '9389', '19', 'p', '8519', '9319', 'o', '4641', 'l', '8953']

Answer:
a, b, e, f, l, o, p, q, t, y