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: ['6495', '2259', '8213', 'm', 'y', '3377', 'q', 'i', '1299', 's', 'w', '4331', 'h', '5459', '4059', '6637', '8069', '5367', '6025', 'l', 'v', '4503', 'd', 'x', 'w', '5067', '9019', 'd', '7919', '7299', 'v', '8957', 'v', '5341', '2617', '8169', 'n', 'y']
Example Output: d, h, i, l, m, n, q, s, v, w, x, y

Example Input: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']
Example Output: a, c, e, g, j, l, n, q, s, x

Example Input: ['6945', 'j', '2211', 'x', 'a', 'n', '4953', '7969', '2583', 'g', '9529', 'j', '8151', '9455', '6135', '2239', 'm', '5725', 't', '553', 'g', '4055', 'r', 'k', '6737', '7721', '257']
Example Output:
a, g, j, k, m, n, r, t, x