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]: ['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']
[EX A]: f, h, i, k, m, n, o, s, u

[EX Q]: ['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']
[EX A]: a, c, d, f, g, j, k, l, m, o, q, u, w, y

[EX Q]: ['o', 'f', '7869', '3643', '3415', '4637', '9137', '7397', 'c', 's', '2595', '4345', 'k', '7299', 'e', '1259', '4615', 'o', '3123', '5149', 'k', '3701', 'b', '415']
[EX A]:
b, c, e, f, k, o, s