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]: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
[EX A]: f, h, o, p, r, s, u, w, y, z

[EX Q]: ['459', '1729', 'b', 'c', '9619', '4461', '4347', '6733', 'i', '3631', 's', 'j', 'i', 'r', '5293', 'q', '7397', '4309', 'c', 'n', 'k', '197', 'q', '8139']
[EX A]: b, c, i, j, k, n, q, r, s

[EX Q]: ['6453', '2449', '9279', '4017', '9469', '863', '5323', '5031', '6635', 'd', 'a', '2341', '6969', 'a', 'v', '9039', 'e', 'e', '7275']
[EX A]:
a, d, e, v