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: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']
Example Output: a, c, e, o, r, s, z

Example Input: ['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']
Example Output: b, e, j, k, l, p, q, t, w, x

Example Input: ['7009', '3933', 'l', '7601', '5663', '7471', '9665', 'q', '6575', '4643', 'k', '1855', 'g', 'l', 'l', '5723', 'p', '5323', '1013', 'k', '4353', 'x']
Example Output:
g, k, l, p, q, x