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: ['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
Example Output: h, o, s, v, w, y

Example Input: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
Example Output: a, e, g, j, k, l, o, p, r, s, t, x, y, z

Example Input: ['8091', '4137', '5623', 'b', '4779', '9393', 'c', '4577', '1727', '4241', '8289', '8903', 'p', '5623', '7087', 'y']
Example Output:
b, c, p, y