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: ['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']

Output: a, b, c, d, e, j, k, l, m, p, s, t, w, y, z


Input: Consider Input: ['d', 'o', '7643', '9065']

Output: d, o


Input: Consider Input: ['4815', '7901', '9351', '8969', '4059', '8515', 'z', 'd', 'h', 'k', 'c', '1121', 'e', 'g', 'v', '8201', 'x', '8813', 'o', '259', '5019', 'h', '53', '2981', 'k', '3147', '6997', '8343', 'd', 'l', 'e', '4427', 'x']


Output: c, d, e, g, h, k, l, o, v, x, z