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: ['2393', 'c', '4413', '5529', '1487', '2499', 'i', 's', 'i', '8575', 'm', 'z', '7179', '6637', '9181', 'z', 'h', '2487', 'i', '3779', '2017', '5217', '5013']
Example Output: c, h, i, m, s, z

Example Input: ['o', 'c', '6469', 'x', '8815', '4441', '6193', 'u', 'm', 'a', '9879', 'p', '8335', 'c', 'z']
Example Output: a, c, m, o, p, u, x, z

Example Input: ['4007', 'o', '9493', '4047', '5361', 'l', '6767', '1253', '6801', 'm', '8739', 'a', 's', '4011', '6187', '8517', 'f', 'p', '889', 'r', 'z', '1295', 'o', 'a', '1799', '2137', '2829', '6545', 'e', '6317', '1187', 'u', '4345', '5381', 'x', '5601', 't', '5877']
Example Output:
a, e, f, l, m, o, p, r, s, t, u, x, z