Definition: 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: ['2325', '2479', '449', '1585', 'v', '4513', 'k', '1309', '7471', '9309']

k, v