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: ['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']
Example Output: b, c, d, f, g, h, i, k, l, o, p, q, r, v

Example Input: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
Example Output: c, g, j, m, q, r, s, w

Example Input: ['819', '1461', '2087', '2767', 'z', '8973', '9751', '8119', '6497', '4167', 'c', 'v', '7831', '1381', 'r', 'q', '5557', '6815', 't', '9633', 'v', '9949', '9917']
Example Output:
c, q, r, t, v, z