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]: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']
[EX A]: i, k, o, q, r

[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]: ['875', '3685', '7953', '4695', 'h', '7441', 'y', 'a', '6741', '1913', 'e', 'z', '9709', '8359', 'k', '2375', 'l', 'z']
[EX A]:
a, e, h, k, l, y, z