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: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
Example Output: c, h, l, u, x

Example Input: ['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']
Example Output: f, k, m, x

Example Input: ['165', 'j', 'v', 'i', 'j', '4983', 'o', '8131', 'y', 'r', '6795', '7517', '5253', '5663', '1837', 'r', 'k', 'y', '1169', '1015', '9785', 'b', '4551', '8299', '3781', 'z']
Example Output:
b, i, j, k, o, r, v, y, z