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]: ['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']
[EX A]: a, c, d, e, f, g, h, j, k, m, n, o, u, v, z

[EX Q]: ['3307', 'r', '2665', '3453', 'f', 'd', 'v', '3801', '3153', '3137', 'y', 'i', '9681', 'k', '9253', 'y', 'i', '8631', '2375', '5131', 'r', 'z', '8645', '595', 's', '6749', '2665', '709', '8203']
[EX A]: d, f, i, k, r, s, v, y, z

[EX Q]: ['6349', 'j', 'o', '3035', 'k', 'k', '4219', '125', '2529', '115', '9239', '4607', '1841', 'j', 'p', 'z', '3023', '6629', 'k', 'g', '6447', 'o', 'z', 'd', '1399', '3443', '5915']
[EX A]:
d, g, j, k, o, p, z