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.

[EX Q]: ['f', 'w', 'y', 't', '5269', '9989', 'p', 'v', '6609', 'v', 'c', 'q', 'm', '6565', '189', 'm', '3617', 'b', '9147', '665', 'v', '5989', '1511', '3123', '6667', '4661', '185', 'b', '3405', 'b', '6027', 'n', '6973', '505', 'g', '815', '3439', '2069', '291', 'j', 'f', '1121', '8009', 'm', '8353']
[EX A]: b, c, f, g, j, m, n, p, q, t, v, w, y

[EX Q]: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']
[EX A]: d, f, j, r, t, z

[EX Q]: ['q', 'w', '2697', '581', 'w', '2849']
[EX A]:
q, w