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]: ['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
[A]: a, b, c, i, k, l, m, p, q, s, u, x


[Q]: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
[A]: g, i, j, l, o, p, q, r, v


[Q]: ['l', '913', 'n', '8669', 'm', '7721', 'd', '4347', '4029', '5615', '6235', 'x', '8123', '6441', 'x', '1761', 'c', '8575', 'z', 't', 'k', 'j', '5095']
[A]:
c, d, j, k, l, m, n, t, x, z