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]: ['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']
[EX A]: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z

[EX Q]: ['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']
[EX A]: b, d, e, f, n, o, p, q, r, v, w, z

[EX Q]: ['u', 'y', 'u', 'd', 'y', '7219', 'f', '5711', 'q', 'o', '5997', '535', '3959', '8047', 'g', '7865', '7263', 'm', 'r', '2413', 's', 'g', '7989', '7751', '3241', '3791', '3467', '3639', 'a', 'h', 'e', '617', 'c', '617', 'v', '1157', 'k', '249', '2731', '5465']
[EX A]:
a, c, d, e, f, g, h, k, m, o, q, r, s, u, v, y