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]: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
[EX A]: h, p, r, u, z

[EX Q]: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
[EX A]: c, g, j, m, q, r, s, w

[EX Q]: ['i', 'r', 'k', 't', 'p', 'e', '8207', '1619', 'k', '5891', 'r', '1499', '4343', 'p', 'i', 'q', 'u', 'x', '837', '1107', 'i', 'n', '6957', 's', 'z']
[EX A]:
e, i, k, n, p, q, r, s, t, u, x, z