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: ['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']
Example Output: r, t, x

Example Input: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']
Example Output: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z

Example Input: ['8463', 'b', 'e', '8561', 'y', 'e', 'b', '787', 'z', '7091', 'n']
Example Output:
b, e, n, y, z