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]: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']
[EX A]: a, c, d, e, f, k, l, m, n, q, t, w, z

[EX Q]: ['x', 'i', 'r', '6011', 't', 'f', 'b', 'i', '8367', '4051', '1459', 'f', '5583', '9609', 'l', 'q', 'g', '8443', 'o', '8697', '7053', '8325', 'k', '7021', 'q', 'm', '6899', '9981', '8985', 'i', 'j', '8043', 'k', '535', '7603', '7629', 'k', '2779', 'g', '2049', 'x', 'd', '8527', 'k', 'q']
[EX A]: b, d, f, g, i, j, k, l, m, o, q, r, t, x

[EX Q]: ['f', '5867', 'h', 'd', '3927', '2879', 'd', 'z', '7523', '7797', '6047', 'w', 'x', '1855', '9209', 'r', 'f']
[EX A]:
d, f, h, r, w, x, z