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: ['2165', 'f', '5081', 's']

Output: f, s


Input: Consider Input: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']

Output: g, h, i, j, m, n, p, s, t, w, x


Input: Consider Input: ['t', '6277', '7769', '8179', 's', '379', '6201', '4415', 'w', 'l', '3579', 'a', '4191', 't', 'p', 'i', '6865', 'v', 'e', '5325', '1031', '8431', '931', '9241', '8499', 'u', '9981', '1045', 'z', '8309', 'j', 'u', '4811', 'x', '513', '9693', '519', 'z', '7477', 'h', 'r', '4193', 'x', '5293', '3999']


Output: a, e, h, i, j, l, p, r, s, t, u, v, w, x, z