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.

[EX Q]: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']
[EX A]: e, g, j, l, n, q, r, s, t, v, x, y, z

[EX Q]: ['o', 'z', 'h', '3965', 'n', '3009', '173', '997', '3987', '5799', '2331', 'p', 'x', '897', '8213', '451', 'u', 't', 't', '9917', '4501', 't', 'c', 'i', 'w', 'w', 'u', '2977', 't', 'b', '4161', '9281', 'w', 'f', '3137', '5745', 'e', '673', '6363', 'h', 'q', 'x', 'm', '9505']
[EX A]: b, c, e, f, h, i, m, n, o, p, q, t, u, w, x, z

[EX Q]: ['i', '3799', 'e', 'b', '4735', 'f', 't', '1419', '8735', '6219', '8455', '2371', '8585', 'y', '8967', '9457', 'k', '5481', '9989', '9481', 'i', '4289', 'h', '5505', '1553', 'y', 'm', '6921', 't', '8063', 'a', '6641', '7929', 'x', 'z', 'd', '8621', 'a']
[EX A]:
a, b, d, e, f, h, i, k, m, t, x, y, z