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: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']
Example Output: b, h, n, u

Example Input: ['r', 's', '2471', 'n', '635', 'k', '3551', '7041', '8765', '1221', '8439', '7773', '6471', 'u', 'p', '2093', '6479', '1435', '6881', 'a', 'y', 'm', 'r', '1627', 'w', 'k', 'b', '3095', '9059', '285', 'y', 'a', 'm', 'x', '637', 'i', '3407', 'e', 'e']
Example Output: a, b, e, i, k, m, n, p, r, s, u, w, x, y

Example Input: ['p', 'e', '7799', 'h', 'q', 'o', 'n', '8083', '5425', 'u', '5815', '4837', '5009', 'e', 'n', 'q', 'm']
Example Output:
e, h, m, n, o, p, q, u