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]: ['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']
[A]: a, d, e, j, k, l, m, q, t, u, x


[Q]: ['m', '7807', 'n', 'w', '5097', '1023', '2723', 'u', '3055', '7285', 'f', 'm', 'w', '5197', '9743', '7519', '4451', 'c', 't', '1939', '5847']
[A]: c, f, m, n, t, u, w


[Q]: ['w', 'w', 'p', 'g', 'z', 'c', '9079', 'u', 'k', '4467', '8733', '5785', 't', 'i', 'p', 'd', '2929', 'b', '5197', '8145', 'n', '349', '5553', '7303', 'd']
[A]:
b, c, d, g, i, k, n, p, t, u, w, z