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.

Example Input: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
Example Output: a, b, g, l, r, s, t, w, y

Example Input: ['6143', 'y', '5505', '9813', 'r', 'v', 'u', '8681', '2387', 'u', 'o', 'm', '9793', 'm']
Example Output: m, o, r, u, v, y

Example Input: ['r', 'q', '3253', '4403', '3515', 'e', '9093', 'm', '9155', 'h', '4489', 'a', 'x', 'i', '193', 'v', '841', 'j', 'v', '7005', '9523', 'b', 'n', '9499', '3079', '4249', '6251', 'f', 'n', '3731']
Example Output:
a, b, e, f, h, i, j, m, n, q, r, v, x