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', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']
[EX A]: a, b, c, d, e, j, k, l, n, o, p, r, y, z

[EX Q]: ['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']
[EX A]: a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z

[EX Q]: ['v', 'o', '881', 'w', '9293', '8349', '1209', '6553', '2443', 'q', '3325', '4219', '5691', '9709', '8167']
[EX A]:
o, q, v, w