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]: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
[EX A]: c, f, j, k, o, y

[EX Q]: ['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
[EX A]: g, n, q, w, z

[EX Q]: ['4845', 'f', '3259', '1445', '3231', '1675', 'w', '1805', '2881', 'x', '6669', '8777', 'y', 'c', '7973', 'o', 'n', 'g', '3265', 'p', 'l', 'h', 'o', '1639', '7635', 'm', '4281', '3441', '6735', 'w', 'r', '6755', 'k', 'j', '2699', '1', 'g', 'd', '4513', '3661', '6505']
[EX A]:
c, d, f, g, h, j, k, l, m, n, o, p, r, w, x, y