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: ['o', 'd', '6495', '5211', '341', 'v', '385', 'v', 'g', 'v', 'l', '7631', '2675', 't']
Example Output: d, g, l, o, t, v

Example Input: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
Example Output: c, e, f, h, j, l, n, p, q, s, v, w, x

Example Input: ['1685', 'm', '2897', '7683', '7239', 'f', '4277', '1381', '9781', 'm', '643', 'z', '2765', 'w', 'v', 'a', '2443', 't', 'b', 'k', 't', 'i', '2121', 'x', 'w', 'i', '1703', 'z', 'm', '6571', 'x', 't', '1997', 'i', '8205', 'k', 'k', 'z', '323']
Example Output:
a, b, f, i, k, m, t, v, w, x, z