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]: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']
[EX A]: e, g, h, i, n, q, r, s, w, x

[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]: ['3123', '5273', '4807', '5959', 'g', 'l', '767', 'f', 'm', 'c', 'w', '7631', 'h', 'c', 'v', 'w', 'z', 'c', 'n', 't', '7685', 'c', '739', '8367', '553', 'y']
[EX A]:
c, f, g, h, l, m, n, t, v, w, y, z