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.

['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
c, d, e, h, i, u, w, x, y

['7591', '7521', 'm', '1429', 'x']
m, x

['f', '3313', 's', '2399', 'k', 'd', 'z', 'y', 'd', '2197', '9369', '4973', '9521', '681', '8459', '3091']

d, f, k, s, y, z