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.

Input: Consider Input: ['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

Output: d, f, i, l


Input: Consider 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']

Output: c, g, k, n, p, q, s, u, v, w, x


Input: Consider Input: ['1027', '3527', 'x', 'i', 'o', '3143', '6589', '6601', 'j', '3743', 'y', '3775', '4923', '9927']


Output: i, j, o, x, y