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', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']
Example Output: a, b, d, f, j, k, m, r, t, u, w, x, z

Example Input: ['7065', 'q', 't', '3177', '9035', 'i', 'l', 'd', '8961', '1183', '6507', 'u', 'c', 't', '2467', '7659', 'e', '8963', 'j', 'g', 'p', '6779', '7115']
Example Output: c, d, e, g, i, j, l, p, q, t, u

Example Input: ['w', 'u', 'z', 'u', '2129', 'i', 'c', '6009', '8143', 'y', '6271', '6561', 'w', 'q', '7203', 'j', '549', '49', '489', 'i', 'z', 'n', 'j', '2137', 'x', 'd', '787', '5899', '5019', 'n']
Example Output:
c, d, i, j, n, q, u, w, x, y, z