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: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
Example Output: b, d, i, j, r

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: ['p', 'c', '3343', 'g', '3703', '6099', '4887', 'd', 's', '3907', '3539', '649', 's', 'v', '3527', '9973', '2671', '6041', 'k', '871', 'o', 'f', '8125', '7337', '8341', 'u', 'c', 'j', '1739', '887', 'x', '5225', '1687', '5809', '5285', 'u', 't', '325']
Example Output:
c, d, f, g, j, k, o, p, s, t, u, v, x