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]: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']
[EX A]: b, e, f, i, k, l, m, o, p, q, r, t, v, w, y

[EX Q]: ['j', '917', 'w', 't', '8873', '1431', '8059', '7041']
[EX A]: j, t, w

[EX Q]: ['q', 'o', '1111', 'e', '5611', 'o', '9705', 'w', 'b', 't', '3051', 'y', '7999', 'o', '5385', '2223']
[EX A]:
b, e, o, q, t, w, y