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.

[Q]: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']
[A]: a, b, d, g, h, i, j, k, l, m, n, p, r, w


[Q]: ['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']
[A]: a, b, c, e, f, g, j, l, o, q, s, t, u, w, y


[Q]: ['5651', '5477', '5073', '5121', 'f', '8613', 's', 'q', 'f', '4115', '8961', 'g', '2959', '5825', 'i', '5467', 'l', '1719', '2349', '4121', 'd', '6831', 'j', '4117', 'z', '2853', 'k', '1813', 'g', '3603', '1153', 'c', '1601', 'y', 'a', '881', '909', 'f', 'p', 'e', 'f', '7247', '4327', '2211', '9989']
[A]:
a, c, d, e, f, g, i, j, k, l, p, q, s, y, z