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: ['n', '9571', '2983', '7597', 'v', 'y', '1993', '1403', '8309', '7043', 'c', '7329', 'p', '4479', 'p']
Example Output: c, n, p, v, y

Example Input: ['t', 'm', 'v', 'q', '3457', '2587', '4473', '9863', '7369', 'u', 'l', 'f', '9501', '3965', 'k', 's', 'n', 'a', 'q', 'f', '3943', 'q', 'j', 'c', '4019', '3935', 'w', 'm', 'm']
Example Output:
a, c, f, j, k, l, m, n, q, s, t, u, v, w