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]: ['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']
[A]: a, b, c, d, e, j, k, l, m, p, s, t, w, y, z


[Q]: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']
[A]: b, c, e, g, h, o, p, q, v, x, y, z


[Q]: ['5223', '8001', '3485', '9035', 'q', '3727', '4727', '4747', '2031', 'n', 'f', 'x', 'o', 'b', '7165', 'x', '2393', '9101', 'x', 'z', '1145', 'l', '2131', 's', '713', 'y', '567', '6485', '131', '7373', '8873', '897', 'n', '101', '285', 's', '4627', '8115', 'b', '9003', '3413', '8709', 'z']
[A]:
b, f, l, n, o, q, s, x, y, z