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]: ['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']
[EX A]: a, e, h, i, k, l, n, p, s, t, w, x, y, z

[EX Q]: ['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']
[EX A]: a, b, c, e, f, g, j, l, o, q, s, t, u, w, y

[EX Q]: ['6605', '5029', 'h', 'o', '5917', '8753', '6465', 'c', '2083', 'm', 'j', '697', 'g', '2973', 'a', '6771', 'r', '5343', 'd', '7293', 'r', '8763', '7721', 'k', '3311', 'q', '4131', 'u', 'n', 'k', '9349', 'e', 'q', 'k', '1771', 'r', 'l', '9113', '79', '7367', '4015', '3913']
[EX A]:
a, c, d, e, g, h, j, k, l, m, n, o, q, r, u