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]: ['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]: ['q', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']
[EX A]: b, c, d, e, l, n, o, q, r, w

[EX Q]: ['9625', '2131', '9191', '8883', 'p', 'e', 'c', '3581', '6067', '5139', '8973', 'q', '6463', 'v', 'y', 'v', '3301', 'q', '1271', '1511', '2537', '705']
[EX A]:
c, e, p, q, v, y