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]: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']
[A]: h, m, p, w, y


[Q]: ['789', '3603', '3517', '5831', 'z', 'q', 'w', 'l', '5701', '9503', '8169', '1123', 'e', '529', 'j', 'z', 'l', 'o', '3705', 'o', '5131', '6063', 'c', 'j', '6275', '7701']
[A]: c, e, j, l, o, q, w, z


[Q]: ['d', '7171', 'k', 'q']
[A]:
d, k, q