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: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
Example Output: g, i, j, l, o, p, q, r, v

Example Input: ['2409', 'q', 'w', 'e', 'x', '4737', 'w']
Example Output: e, q, w, x

Example Input: ['1931', 'p', 'h', 'r', 'm', 'l', '4937', 'g', 'b', '1197', 'n', 'm', 'w', 'n', '7717', 's', 's', '1551', '8431', '9467', 'a', '4925', 'p', '3729', 'm', 'k', 'g', 'v', '6763', '3649', '6629', 't', 'w', 'j', 'z', 'm', '7643', 'n', '3951', '7267', '4415', 'y', 'z']
Example Output:
a, b, g, h, j, k, l, m, n, p, r, s, t, v, w, y, z