Q: 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.
['a', '1039', '7987', 'z', '8425', '4727', '8399', '3391', 'n', '4907', '8343', 'i', '3445', '9797', '1117', 'e', '865', '7007', 'j', 'a', 'n', '7205', '2487', 'k', 'm', 't', 'q']
A:
a, e, i, j, k, m, n, q, t, z