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: ['s', 'w', '8949', '4025']

A: s, w
****
Q: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

A: a, b, c, d, e, g, h, q, u, w, y, z
****
Q: ['9527', '2091', 'n', 'p', '8125', '4537', '8713', '7221', 'f', '2981', 'k', 'u', 'o', 'c', 'v', '7585', '6921', '2291', 'a', '1473', '3013', 't', '5385', '1167']

A:
a, c, f, k, n, o, p, t, u, v
****