You will be given a definition of a task first, then some input of the task.
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.

['7745', '8281', '8085', '9587', '2633', '1529', '7911', 'k', '9865', '3147', '6997', 'i', '4687', '8483', 't', 's', 'j', 'l', 'e', 'x', 'z', '1365', '4671', 'e', 't', '2105', 'w', '4485', 'v', '3815', '8395', '5617', '5625', 'f', '3715', 'f', '8693', '197', '9239']
Output:
e, f, i, j, k, l, s, t, v, w, x, z