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.

[Q]: ['s', 'w', 'c', '4137', 't', '2437', '349', 'h', '4539', 't', 'b', 'y', 'q', 't', '9087', 'c', '9489', '6285', '6247', '8353', 'n', 't', '8661', 'p', 'z', 'p', '773', 'w', 'q', '8081', 'r', 'u', 'z', 'k', 'a', 'b', '7513', '5549', '5325', '1101', 's', '6507', '3317']
[A]: a, b, c, h, k, n, p, q, r, s, t, u, w, y, z


[Q]: ['2453', 'r', 'd', '8499', 't', 's', 'h', 'a', 'm', '9271', 'g', '2599', '6209', 'o', 'i', '4069', 't', '6793', '7679', '6643', '7359', 'm', 'f', 'w', '775', '3347', '6161', '9745', 'i']
[A]: a, d, f, g, h, i, m, o, r, s, t, w


[Q]: ['3349', '4871', '1305', '3453', 'p', '1593', 'j', 'y', '7939', '9097', 'u', 'i', 'f', 'p', 'd', 'l', 'u', '1889', 'l', 'n', '7553', '927', 'n']
[A]:
d, f, i, j, l, n, p, u, y