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]: ['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']
[EX A]: d, e, f, i, j, l, m, o, r, s, u, v, y

[EX Q]: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']
[EX A]: e, f, l, n, p, q, r, s, w, y

[EX Q]: ['8589', '1489', '2371', '617', 'y', '9791', '2535', '419', '3817', 'f', '7237', 'e', '7167', '9999', 'v', 'z', '8475', 't', '751', '5471', '2539', '9693', 'z', 'k', '3983', 'b', 'h', 'q', 'o', 'b']
[EX A]:
b, e, f, h, k, o, q, t, v, y, z