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: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']
Example Output: c, g, l, n, r, u, v, w, z

Example Input: ['6193', 'x', 'a', '4761', 'o', '399', '9103', 'v', '3351', '8493', '9009', '4273', '3821', '4849', 'l', '3091', '7325', '6697', 'k', '5519', 'a', 'l', '365', 'r', 'j', 'l', 'o', '2961', 'a', 'q', '7883', 'b', '1927', 'h', '4343', '609', '9897', 'm', 'z', '4245', '4779', 'p']
Example Output:
a, b, h, j, k, l, m, o, p, q, r, v, x, z