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: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
Example Output: f, h, o, p, r, s, u, w, y, z

Example Input: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']
Example Output: h, m, p, w, y

Example Input: ['t', 't', '689', '4801', 'd', 'i', 'f', 'j', 'h', '2671', 'b', 'c', '5645', '7937', '7773', 'k', 'm', '8437', 'o', '1713', 'e', '393', '1017', 'c', '527', '613', '5003', 'd', '1375', 'k', 'z']
Example Output:
b, c, d, e, f, h, i, j, k, m, o, t, z