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]: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
[EX A]: c, d, k

[EX Q]: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']
[EX A]: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z

[EX Q]: ['9297', 'p', 'u', 'o', '5449', 'v', 'e', '2853', 'y', 'i', 'v', 'e', '2441', 't', '4479', 'q', '2763', 'l', 'v', '1399', '6827', 'n', 'i', '7221', 'a', '5835', '37', '4281', 's', 'o', 'b', 'h', 'l', '4597', '8233', '8135', '7539', 'j', 'y']
[EX A]:
a, b, e, h, i, j, l, n, o, p, q, s, t, u, v, y