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.

['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
a, h, o, p, y

['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
b, d, i, j, r

['h', 's', 'c', '1785', '5027', 'v', '5591', 'g', 'a', 'w']

a, c, g, h, s, v, w