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]: ['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']
[EX A]: b, f, g, h, j, l, n, s, t, v, x, y, z

[EX Q]: ['t', 'r', '2959', '2517', 'a', '9959', '729', '511', 'y', 'r', '465', 'c', '687', 'm', 'b', 'm', '3449', '9713', 'g', '8275', '8823', 'a', 'z', 'w', '2185', '6283', '8457', '8137', '7163', '8329']
[EX A]: a, b, c, g, m, r, t, w, y, z

[EX Q]: ['5015', '6139', '2471', 'x', 'k', 'x', '5459', '6677', 't', 'w', '2401', '9827', 'b', '905', 'w', 'y', '5607', '4005', '3515', '2373', '2145', 'n', 'n', 't', '8363', 'j', '1785', 'q', 's']
[EX A]:
b, j, k, n, q, s, t, w, x, y