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: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']

Output: c, e, f, g, h, k, l, m, n, o, u, x, y, z


Input: Consider Input: ['k', 'c', 'i']

Output: c, i, k


Input: Consider Input: ['2879', 'n', 'h', 'x', '5091', 'w', '7877', 'k', 'p', '423', 'w', 'o', 'n', '2053', '4131', 't', '3095', '3273', '6599', '1509', 'b', '7183', '7295', '8737', '5147', '679', 'd']


Output: b, d, h, k, n, o, p, t, w, x