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: ['h', 'n', '6451', 't', 'r', 's', '6583', '3671', '909', '5233', 'l', 'w', 'v', '3319', 'q', '1079']
Output:
h, l, n, q, r, s, t, v, w