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: ['6597', '7889', 'x', 'v', 'm', 'j', 'j', 'w', 'v', '177', 'x', '8353', '5897']
Example Output: j, m, v, w, x

Example Input: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']
Example Output: e, g, j, l, n, q, r, s, t, v, x, y, z

Example Input: ['7641', '4759', '1083', 'g', 'j', '431', '9297', '5797', 't', 'p', '5219', '9667']
Example Output:
g, j, p, t