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]: ['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']
[A]: e, i, n, r, t, z


[Q]: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']
[A]: e, f, j, n, p, r, w, z


[Q]: ['i', '8603', 'y', 'x', 's', '195', 'd', '7651', '1011', 'l', '7785', '6009', '6907', '3535', 'n', '9411', '301', 'm', 'u', '8411', 'j', '6671', 'x', 'f', 'w', 'w', '5281', '6825', 'c', 'c', '7723', 'e', 'g', '5595', 'd', '6301', 'p']
[A]:
c, d, e, f, g, i, j, l, m, n, p, s, u, w, x, y