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: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']

Output: b, d, i, j, r


Input: Consider Input: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']

Output: d, e, k, l, o, s, t, u, w, y


Input: Consider Input: ['v', 'z', 'o', 'w', 'y', 'i', 'h', '9575', '2745', 'a', 'p', 'h', '6403']


Output: a, h, i, o, p, v, w, y, z