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]: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']
[EX A]: b, e, f, i, k, l, m, o, p, q, r, t, v, w, y

[EX Q]: ['815', '6967', '6553', 'r', 'y', '3641', 'q', 'b', '6131', '4289', 'w', '6093', '6055', 'i', 'b', 'y', '5107', 'v', 'g', '9709', 'x', 'i']
[EX A]: b, g, i, q, r, v, w, x, y

[EX Q]: ['7015', '7755', '7881', 'k', '7973', 'r', '6655', '521', 'v', '5969', '3783', '5515', '4207', '475', '7229', 'i', '8235', 'u', 'q', 'c', '3603', 'j', 'm', 'q', '5943', 'a', 'w', 'a', 'z', '6663', '2115', 'a', '5955', 'x', 'r', 'q', 'm', '7307']
[EX A]:
a, c, i, j, k, m, q, r, u, v, w, x, z