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]: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']
[A]: f, i, k, m, o, p, r, t, u, x, z


[Q]: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']
[A]: c, g, q, t, u, v, w, y


[Q]: ['i', 'r', 'b', 't', 'o', 'f', 'v', 'x', 'w', '39', 'u', '2121', 'v', '9111', 'u', '6635', '3143', '4105', 'z', 'n', '4211', '2955', 'r', 'g', '4701', '8161', 'w', 's', '6915', 'v']
[A]:
b, f, g, i, n, o, r, s, t, u, v, w, x, z