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]: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']
[A]: a, e, f, i, j, m, p, q, t, u, v


[Q]: ['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']
[A]: b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y


[Q]: ['3419', 'q', 'b', '7519', 'g', 'p', '5013', '8417', '7219', '455', '2417', 'j', '381', 'i', 'y', '4205', '2295', '1419', 'e', '4643', 's', 'p', 'h', 'y', 'c', 'h', '3571', 'x', '3393', 'o', 't', 'w', 'a', '9947', '2437', 'g', '819', '4385', '945', 'o', 'w', '1293', '3693', '2621', 'q']
[A]:
a, b, c, e, g, h, i, j, o, p, q, s, t, w, x, y