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.
['k', '5915', '7245', '2011', '7717', '2355', 'q', '501', '7597', '5661', '5635', '8901', 'x', '6779', '1871', '6447', '4721', 'f', 'j', '1939', '9271', '4227', 'f', 'o', '5397', '983', 'a', 'g', '6239', 'v', 'c', 'i', '7405', '7151', '5723', 'j', '413', '5347', 'd', '2317', 'h', 'z', '223', '3687']
A:
a, c, d, f, g, h, i, j, k, o, q, v, x, z