Instructions: 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.
Input: ['3865', '6389', '5269', 'n', '3115', '1321', 'g', 'o', '6113', '4499', '5983', 'q', 'o', '9785', '7157', '4189', '6963', '3415', 'd', '135', '441', 'd', 'b', 't', '383', 'c', 'r', '6053', 't', '4877', 'd', 'v', 'a', 'y', 'd', 'h', '1525', '9833', 'a', 'u', 'z', 'j']
Output:
a, b, c, d, g, h, j, n, o, q, r, t, u, v, y, z