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]: ['n', '7337', '6887', '2203', '4663', '2837', '6451', '959', '8027', 'p', 'v', 'q', 'g', '8059', '6151', 'v', '7097', '6583', '7637', '2367', 'w', '9603', '5365', '3773', '1707', 'k', 'x', 's', 'c', 'u', '3641', '6137', '1207', 'k', '5531', '4543']
[EX A]: c, g, k, n, p, q, s, u, v, w, x

[EX Q]: ['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']
[EX A]: d, h, q

[EX Q]: ['6617', 'g', '5983', '1527', '2387', 'j', 'z', '4689', 'f', '1535', '5889', 'u', 'u', 'l', '1407', '1273', '2041', 'k', 'h', '6803', '7291', '9065', '6215', '9365', 'z', 'f']
[EX A]:
f, g, h, j, k, l, u, z