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.

Example Input: ['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']
Example Output: c, g, k, n, p, q, s, u, v, w, x

Example Input: ['9117', '1153', 'f', 'b', '9979']
Example Output: b, f

Example Input: ['2037', '3101', '4901', '7391', 's', 'y', '5901', '7255', 'c', 't', 'i', 'x', '7185', 'p', '7515', 't', '8987', '5741', '8309', 'b', 'g', 'r', '7305', 'p', 'm', '9369', 'z', '1085', 'o', '7777', '1989', '8967', '5333', '941', 'h', '5765', '1941', 'b', 'x', 'd', '6581', '1229']
Example Output:
b, c, d, g, h, i, m, o, p, r, s, t, x, y, z