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

[EX Q]: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
[EX A]: a, b, d, e, g, h, o, r, u, v, w, y, z

[EX Q]: ['5509', 'b', 'd', '3817', '6429', '8475', '6099', '8209', 'd', '2693', '6935', '7295', 'w', '9827', '3687', 'z', 'h', 'r', 'v']
[EX A]:
b, d, h, r, v, w, z