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]: ['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']
[EX A]: f, i, j, m, q, r, t, y

[EX Q]: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']
[EX A]: a, b, c, e, f, g, k, l, m, p, s, t, u, y

[EX Q]: ['633', 'x', '9797', '5813', 'v', '909', 'i', 'p', 's', 'd', '2301', '6263', '5421', '4995', '3575', '5247', '5853', 'v', '3633', 'k', '453', 'e', 'h', '7197', '2841', '469', '3741', 'z', 'r', 'w']
[EX A]:
d, e, h, i, k, p, r, s, v, w, x, z