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: ['k', 'c', 'i']
Example Output: c, i, k

Example Input: ['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']
Example Output: b, c, h, i, k, l, m, o, s, t, u, v, y

Example Input: ['8905', 'w', '2629', '8177', '7363', '2707', '8665', '4707', 'w', 'u', '6615', '6013', 'o', '7563', 'g', 'q', 'b', 'u']
Example Output:
b, g, o, q, u, w