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.

[EX Q]: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']
[EX A]: c, e, f, g, h, i, k, n, s, u, w, y, z

[EX Q]: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']
[EX A]: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z

[EX Q]: ['299', 't', 'v', '8759', '6591', 'o', '7775', '5701', '1877', 'p', '6231', 'd', 'u', 'n', 'a', '9081', '3737', '9211', '6665', 'o', 's', 'a', 'w', 'o', 'd', '4081', 'j', '891', 'k', 'p', 'w', '9851', '6709', 'm', '2365', 'n', 'z', 'u', 'e', '7177', 'n', '4827']
[EX A]:
a, d, e, j, k, m, n, o, p, s, t, u, v, w, z