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]: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
[A]: a, d, f, g, i, j, k, m, n, s, u, v, x, y


[Q]: ['n', '2227', '1147', 'm', 'p', 'i', '9107', '863', '4217', '665', 'x', 'n', '5499', 'l', 'o', '8703', 'c', '2169', '1287', '3439', '1413', 'f', 'y', '8401', '3339', 'e', 'u']
[A]:
c, e, f, i, l, m, n, o, p, u, x, y