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: ['3307', 'r', '2665', '3453', 'f', 'd', 'v', '3801', '3153', '3137', 'y', 'i', '9681', 'k', '9253', 'y', 'i', '8631', '2375', '5131', 'r', 'z', '8645', '595', 's', '6749', '2665', '709', '8203']
Example Output: d, f, i, k, r, s, v, y, z

Example Input: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
Example Output: a, h, o, p, y

Example Input: ['q', 'o', 'g', '6005', '8757']
Example Output:
g, o, q