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]: ['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
[EX A]: e, f, i, j, r, s, u, v, w

[EX Q]: ['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']
[EX A]: a, b, c, d, f, h, i, j, k, p, q, t, w, y, z

[EX Q]: ['v', 'x', '5273', 'j', 'y', 'a', 'j', '8475', 'c', '6345', 'n', 's', 'z', 'a', 'k', 'v', 'm', 'p', '4545', '6117', '3209', '9105', 'k', '3035', '6437', '7205', '7603', '863', '8679', 'w', '4011', '5011', 'j', '7279', 'o']
[EX A]:
a, c, j, k, m, n, o, p, s, v, w, x, y, z