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

Example Input: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']
Example Output: d, e, f, g, h, l, p, t, u, v

Example Input: ['b', '9599', 'b', 'h', '1107', 'i', 's', 'f', 's', '775', 'm', '2569', '33', 'r', 'i', '4999', 'i', 'd', 'y', 'c', '5927', '6621', '853', '5617', '3923', 'y', '83', '7509', 'w']
Example Output:
b, c, d, f, h, i, m, r, s, w, y