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]: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
[EX A]: g, h, k, m, n, q, t, u, v, w, x

[EX Q]: ['8927', 'k', 'o', '1169', 'z', 'l', 'i', '3883', 'z', '4163', 't', '4891', 'x', 'e', '1235', 'k', '3967', '6027', 's', '5537', 'i', '6021', '8689', '1127', 's', '4487', '4841', 'n', 'f', '6037', 'n', '5013', '885', '3605', 'w', 'b']
[EX A]:
b, e, f, i, k, l, n, o, s, t, w, x, z