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: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']
Example Output: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z

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: ['6789', '1139', '7511', '9293', 'y', '7493', 'e', 'z', 'w', '8305', 'e', 'j', '2775', 'z', '749', '7219', 'b', '8865', '6489', 'x', '7203', 'w', '6153', 'j', 'b', 'k', '1719', 'b', 'r', '1021', 'a', 'y', '6529', '9687', 'q', '2531', 'j', '8787', '6875']
Example Output:
a, b, e, j, k, q, r, w, x, y, z