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]: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']
[EX A]: d, k, u, w, z

[EX Q]: ['1447', 'q', '9529', '2971', 's', '7351', '6753', '3493', 'v', 'c', 'x', '3097', '9145', 'b', 'e', 'b', '2967', '6933', 'e', 's', 'v', 'f', 'z', 'r']
[EX A]: b, c, e, f, q, r, s, v, x, z

[EX Q]: ['k', '7259', 'y', 'g', 'p', '9723', '609', 'a', '5297', '5281', '4875', '3913', 'f', '8987', '2681', 'w', '5399', 't', 'd', '7681', 'u', 'e']
[EX A]:
a, d, e, f, g, k, p, t, u, w, y