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]: ['w', '743', '5757', '8731', 'k', 'p', '317', 'n', 'x', '5649', 'l', 'm', 'c', '2499', 'l']
[EX A]: c, k, l, m, n, p, w, x

[EX Q]: ['5341', 'a', 'u', 'p', 'q', 'h', '1621', 'c', 'k', '6381', '5733', '5441', '9911', '2155', '6519', 'd', '3613', '9147', 'h', 'd', 'q', 'u', '7435', '1535', '1523', '9105', '573', '571', '7271', '299']
[EX A]:
a, c, d, h, k, p, q, u