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]: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']
[A]: a, b, f, k, m, o, q, s, u, z


[Q]: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
[A]: b, h, i, m, r, u, y, z


[Q]: ['x', 'a', 'p', 'd', 'q', 'v', '3959', 'c', '6657', '1503', '3897', 'n', '807', 'y', 'd', '8179', 'q', 'v', '3383', '5647', 'f', 'r', '6131', 'u', '2357', 'v']
[A]:
a, c, d, f, n, p, q, r, u, v, x, y