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]: ['p', '4329', '2437', '6279', 'u', '459', 'f', 'c', 'i', 'w', 'n', 't', '429', 'n', '73', '4995', 'p', 'z', '8459', '6133', 'y', 'r', '4057', 'a', '2717', '7803', 'r', 'm', '2879', '6989', '7223', 'v', '7929']
[EX A]: a, c, f, i, m, n, p, r, t, u, v, w, y, z

[EX Q]: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']
[EX A]: c, f, g, k, n, p, q, r, u, w

[EX Q]: ['4341', '8809', '7337', 'h', '2857', '4965', '7283', 'x', '2197', 'd', '2711', '9791', '6771', '287', 'i', 'k', '1313', '9583', '515', 'v', '4855', 'p', 'y', 'r', '4837', 'u', 'z', '6477', 'j', 'j', '303', 'y', '7355', '3447', 'q', 'y', '5999', '1537']
[EX A]:
d, h, i, j, k, p, q, r, u, v, x, y, z