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]: ['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']
[A]: e, f, i, o, q, t, v, w, y


[Q]: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']
[A]: e, l


[Q]: ['5363', '1761', 'v', '195', 'i', 'z', 'm', '2315', '9493', 'd', '987', 'd', 'w', 'y', '8863', 'l', 'u', '6691', '825', 'k', '683', 'm', 'd', '9749', '9805', 't', '5623', '8927', '1507', '1233', 'e', '4797', 'r', 'k', '8593', '365', 'l', '2851', 'i', 'm', '4971', '7125', 'y', 'u', '2997']
[A]:
d, e, i, k, l, m, r, t, u, v, w, y, z