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: ['e', 'z', '5199', 'x']
Example Output: e, x, z

Example Input: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']
Example Output: d, k, u, w, z

Example Input: ['c', 'o', 'c', '9777', 'l', 'n', 'a', 'm', 'o', '8487', '5255', '3311', 'x', 'h', 'i', 'n']
Example Output:
a, c, h, i, l, m, n, o, x