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.

[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']
[A]: a, b, c, g, m, r, t, w, y, z


[Q]: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']
[A]: a, b, e, f, h, k, l, m, n, o, t, u, y


[Q]: ['4119', '5275', 'a', 'r', '1455', '6715', 'l', 'i', '4793', 's', 'l', '2281', 'z', '1643', '185', '8867', '7337', '2865', 'd', '6233', '6437', '2685', '9475', 'e', '3429', 'f', 'y', 'u', 'o', '7891', '7913']
[A]:
a, d, e, f, i, l, o, r, s, u, y, z