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]: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']
[A]: a, j, r, z


[Q]: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
[A]: a, c, f, h, i, l, p, w


[Q]: ['a', 'e', 'v', '7255', 'x', 'p', '8827', '2031', 'g', '7417', '1319', '7063', '9273', '5307', '8859', '6737', '7621', '899', '3391', '2371', '3833', 'x', '9569', 'y', 'y', '429', '7139', 'z', '1297', 'q', 'p', 's', 'i', 'v', 'z', 'd', '521', 'n', '705', 'v', 'g']
[A]:
a, d, e, g, i, n, p, q, s, v, x, y, z