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]: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
[A]: b, h, j, k, o, p, q, r, u, v, x, y


[Q]: ['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
[A]: c, e, j, l, n, q


[Q]: ['1991', 'b', '8165', 'f', 'k', 'g', '985', '5271', '1845', '261', 'r', 'g', 'p', '5417', '697', 'a', 'l', '3839', '1665', 'q', '7207', 'r', '3285', '129', '2213', 'f', 'f', 'u', 'c', 'm', 'v', '4603', 'n', 'n', '3525']
[A]:
a, b, c, f, g, k, l, m, n, p, q, r, u, v