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

Output: i, k, o, q, r


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

Output: d, f, i, l


Input: Consider Input: ['o', '2503', 'n', 'e', '7991', 'w', '7891', '2297', '4429', '5725', '7709', '1193', 's', 'a', '5547', 'i', '4549', '675', 'r', '2265', 'r', '3245', 'e', 'q', 'v', 'b', 'o', 'm', '2503', 'm', '8611', '6329', 'e', 'l', 'd', '9603', 'r', 'y', 'b', 'w', '6375', '55', 'z']


Output: a, b, d, e, i, l, m, n, o, q, r, s, v, w, y, z