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.

Input: Consider Input: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']

Output: e, f, j, n, p, r, w, z


Input: Consider Input: ['r', 'q', '3649', 't', '3941', 'z', '3729', 's', 'g', '6905', 'h', 'v', '1085', '6353', 'a', '9395', '5433', 'a', '2565', 'p', 'a', 'h', '1491', 'j', 'b', 'v', 'e']

Output: a, b, e, g, h, j, p, q, r, s, t, v, z


Input: Consider Input: ['9473', 'j', 'p', 'q', 'x', '7569', 'd', 't', 'w', '9129', '735', '7389', 'a', '219', 'g', '133', '3275', '6675']


Output: a, d, g, j, p, q, t, w, x