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: ['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']

Output: c, e, f, k, l, m, p, q, s, v, z


Input: Consider Input: ['2293', 'p', '9787', '7241', '8689', 'u', '3141', 'h', 'c', 'b', 'f', 's', '319', 'c', 'p', '6909', 'p', 'f', '1717', 'd', '2285', 's']

Output: b, c, d, f, h, p, s, u


Input: Consider Input: ['y', 'l', '4115', 'l', 'r', '9751', 'y', 'b', '5027', '919', 'u', '1275', 'f', '8897', '2301', 's', '6379', '4699', 'r', '6313', '8951', 'i', 'u', '6499', 'r', '7181', 'z']


Output: b, f, i, l, r, s, u, y, z