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: ['7677', '4069', 'b', 'w', '4381', 'b', '5757', '711', '765', '8347', '6547', '9527', '945', '5333']

Output: b, w


Input: Consider Input: ['9793', 'i', 'z', '7399', 's', 'v', 'l', 'o', 'y', '1055', '1733', 'b', 'l', '5319', '8753', '1907', 'c', '6177', 'i', '459', '9133', '6081', 'j', 'q', '7645']


Output: b, c, i, j, l, o, q, s, v, y, z