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: ['x', '9149', '4823', '2295', 'd', '4519', 't', 'a', 'd', 'q', '9201', 'q', '4131', 't', '1543', '7249', 'k', 'n', '6693', 's', 'k', '6829', 'v', 'x', '1', 'f']
Output:
a, d, f, k, n, q, s, t, v, x