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.

Example Input: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
Example Output: a, f, q, v, x

Example Input: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
Example Output: d, e, k, l, o, s, t, u, w, y

Example Input: ['u', 'r', 'i', '187', '3873', '6249', '4441', 'p', 'e']
Example Output:
e, i, p, r, u