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: ['1233', '405', '8901', '7147', '8841', 's', 'v', '3131', 'p', 'd', 'y', '5873', '439']
Example Output: d, p, s, v, y

Example Input: ['815', '6967', '6553', 'r', 'y', '3641', 'q', 'b', '6131', '4289', 'w', '6093', '6055', 'i', 'b', 'y', '5107', 'v', 'g', '9709', 'x', 'i']
Example Output: b, g, i, q, r, v, w, x, y

Example Input: ['b', '1713', '4603', '9131', '5235', '1253', '8307', 's', '6709', '5367', '5913', 'j', 'q', '185', '5583', 't', 'o', 'j', 'n', '4151', '4905', '6379', 's', '3747', '3041', 'v', '4227', 'i', '6919', 'g', '3877', '9669', 'c', '4045', '6749', '1987', '369', '71', 'p', '6099', 'z']
Example Output:
b, c, g, i, j, n, o, p, q, s, t, v, z