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', 'w', 'y', 't', '5269', '9989', 'p', 'v', '6609', 'v', 'c', 'q', 'm', '6565', '189', 'm', '3617', 'b', '9147', '665', 'v', '5989', '1511', '3123', '6667', '4661', '185', 'b', '3405', 'b', '6027', 'n', '6973', '505', 'g', '815', '3439', '2069', '291', 'j', 'f', '1121', '8009', 'm', '8353']
Example Output: b, c, f, g, j, m, n, p, q, t, v, w, y

Example Input: ['7591', '1403']
Example Output: -1

Example Input: ['g', 'l', 'u', 'y', '757', '6313', '9063', '6119', 'j', 'j', 'w', '969', '9731', 'p', '1169', 'p', 'x', 'q', 'g', 'u', 'a', 'e', '3689', 'o', 'q', 'y', '1127', '2651', 'c', '6537', '8763', '3871', '625', 'm', '1359', 'r', '7075', '4911', 'm']
Example Output:
a, c, e, g, j, l, m, o, p, q, r, u, w, x, y