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]: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']
[A]: c, e, f, g, h, i, k, n, s, u, w, y, z


[Q]: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']
[A]: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z


[Q]: ['5657', '5813', '4699', 'f', 'd', '5303', 't', 'i', 'p', '1865', '7897', 'u', '8425', 'q', 'p', '3793', 'f', 'w', 'b', '9767', '3413', 'e', '135', '8533', 'p', 'y', '7301', '6003', '1033', '3023', '377', '8667', 'q', '6005', '6079', 'g', '1435', '6011', '5261', '5353', '7869', 'a', 'i']
[A]:
a, b, d, e, f, g, i, p, q, t, u, w, y