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: ['3127', '9253', '5667', '9453']

Output: -1


Input: Consider Input: ['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']

Output: d, e, h, i, l, r, w, y, z


Input: Consider Input: ['4911', 'c', '2051', '7941', '6547', 'e', '6101']


Output: c, e