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: ['3583', 'd', '1481', 'w', 'l', '7261', '2933', 'n', '8725', 'g', '3441', 'r', '287', '7327', '5637', 'r', '5389', 'm', 'j', 'd', 'a', 'e', 'v', '7879', '1731', 'z', '43', 'q', 'p', '4315', 'p', '3651', 'o', 'l', 's', '9787', 'h', '6735']

Answer: a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z


Question: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Answer: c, g, q, t, u, v, w, y


Question: ['k', 'p', 'x', '227', '8921', '4853', '2981', 'l', '8965', 'v', '9317', 'e', 'x', '8685', '6855', 'h']

Answer:
e, h, k, l, p, v, x