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: ['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

Output: f, h, i, l, o, q, r, t, u, v, x


Input: Consider Input: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']

Output: h, m, p, q, u, w, y


Input: Consider Input: ['2523', 'o', 'x', '1533', '8981', '2311', '4327', '815', 'h', 'i', '3305', '8845', 'm', 'r', '6767', '9033', '3387', '1847', '7293', 'm', 'n', '5473', '1151', '7283', 'y', '4021', 'c', 'y', '165', '2519', '9329', '1947']


Output: c, h, i, m, n, o, r, x, y