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: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']
Example Output: c, f, g, k, n, p, q, r, u, w

Example Input: ['l', 'g', 'd', 'p', '8163', '6643', 'o', 'p', 'm']
Example Output: d, g, l, m, o, p

Example Input: ['u', 'h', '5005', 'y', 'r', '8469', '2997', '929', '8433', 'o', '1783', 'a', 'l', 'i', '6405', '5203', '2477', '8811', 'k', '6829', 'l', 'l', '9405', '1373', '6071', 'a', 'y']
Example Output:
a, h, i, k, l, o, r, u, y