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]: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
[A]: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


[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]: ['o', 'k', '517', 'd', 'm', 'k', 'j', '8949', '185', '7', '8245', 'y', '4263', 'n', '6317', '5027', 't', 's', '9157', 'b', '7549', '2603', '4151', '9469', 'y', '6117', '7437', '1637']
[A]:
b, d, j, k, m, n, o, s, t, y