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: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']

Output: e, f, g, k, n, p, q


Input: Consider Input: ['q', 'g', 's', 'g', 'z', '987', '777']

Output: g, q, s, z


Input: Consider Input: ['d', '4949', '5199', 'g', '8959', 'w', 'y', '3451', '1593', '4879', 'o', '8423', 'h', '5051', '7753']


Output: d, g, h, o, w, y