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]: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']
[EX A]: a, c, i, j, n, r, t, v, x

[EX Q]: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']
[EX A]: h, i, m, n, r

[EX Q]: ['j', '6077', '2005', 'k', 's', '6923', 'x', 's', 'x', '165', '4437', '7583', 'v', '1527', 'p', 'w', 'n', '8167', '8477', '3499', 'k', 'm', 'g', 'm', 'w', 'f', 'j', '3759', '3881', 'o', '9377', '1195', 'p', '1899', 'l', 'p']
[EX A]:
f, g, j, k, l, m, n, o, p, s, v, w, x