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]: ['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']
[EX A]: c, e, j, l, o, q, w, z

[EX Q]: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
[EX A]: a, d, f, h, i, j, o, r, u, v, w, y, z

[EX Q]: ['5985', 'y', '4133', '4873', 'e', '997', 'z', 'c', 'a', '1391', '2421', 'i', '8771', 'q', 'j', '1699', '8503', '5775', 'o', '6239', 'b', 'p', '5613', 'h', 'm', '7465', 'o', '1541', '5133', '863', '829', '7999', '9635', '7429', '133', '5313', 'p', 'h', 'u', 'e', '5115', 'j', '2707']
[EX A]:
a, b, c, e, h, i, j, m, o, p, q, u, y, z