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: ['x', 'b', '1467', 'y', '2101', 'y', 'm', '2745', 'z', '429', '7523', 'e', 'f']

Output: b, e, f, m, x, y, z


Input: Consider Input: ['d', '4377', '9271', '8053', '9519']

Output: d


Input: Consider Input: ['8255', '5831', 'v', '4763', '2403', 'o', '4855', 'b', '9661', 's', 'r', '7643', 's', 'y', 'u', 'q', '8165', '3975', '2099', 'v', '4979', '6243', '2151', 'g', '7603', 'v', 'v', 'i', '5567', '861', '3897', 'f', 'u', '2737', '9925']


Output: b, f, g, i, o, q, r, s, u, v, y