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]: ['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']
[EX A]: f, h, i, l, o, q, r, t, u, v, x

[EX Q]: ['699', 'd', '6027', 'j', 'e', 'c', 't', '9983', '5471', '2649', 't', '2631', 'r', 'h', '293', 'j', '8699', 'p', 'k', '5433']
[EX A]: c, d, e, h, j, k, p, r, t

[EX Q]: ['4899', 's', '5687', 'k', 'n', '8375', 'n', '8721', 's', '8399', '8359', '3401', '6301', '3115', 'w', 'n', 'g', 'k', '9553', '2135', 'b', '8987', '9307', '9855', 'h', 'h', '4091', 'u', '767', 'd', '2695', 'k', '7355', 'f', '1417', '2683', '4821', '8889', '8521', '4551', '5375', 'a', '5205', '9799', 'm']
[EX A]:
a, b, d, f, g, h, k, m, n, s, u, w