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: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']
Example Output: c, g, l, n, r, u, v, w, z

Example Input: ['4749', '4607', '625', '6907', 't', 'b', '8479', '6505', 'r']
Example Output: b, r, t

Example Input: ['7895', 'z', '1277', '6719', '9709', 'w', 'u', '4383', 'x', 'a', '2505', 'j', 'u', '8221']
Example Output:
a, j, u, w, x, z