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: ['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: ['2165', 'f', '5081', 's']
Example Output: f, s

Example Input: ['o', '9081', 's', '1719', '151', '9993', 'k', 'v', 'h', 'x', 'i', '5519', '9399', 'j', '9727', 'l', '253', 's', 'w', 'f', 'r', 'h', '8059', 'u', '6363']
Example Output:
f, h, i, j, k, l, o, r, s, u, v, w, x