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]: ['2527', '9123', '8717']
[A]: -1


[Q]: ['4905', 'w', '3143', '2217', '573', '1073', '63', 'a', '3971', '2887', '3485', 'y', '3893', '1059', '7623', 'x', 'd', '2991', 'e', 's', '735', 'm', 's', '257', 'x', '5559', '97', 'p', '7237', '693', '7229', 'd', '2311', '807', 'd', 'l', '1247', 'l', '359']
[A]: a, d, e, l, m, p, s, w, x, y


[Q]: ['s', '4063', '4095', '5051', 's', 'k', '9117', '6231', 'u', '8345', '1217', 'r', '959', 'e', '8645', 'p', 'a', 'u', 'm', 'g', '3411', 'q', '647', 'g', '6053', '2409', 'c', 'x', '2285', 'l', 'b', '975', 'j', '2483', 'h', '3571', '8755']
[A]:
a, b, c, e, g, h, j, k, l, m, p, q, r, s, u, x