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: ['n', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']
Example Output: h, i, k, m, n, o, w, x, y

Example Input: ['u', '1805', 'l', 'l', '5449', 'r', '4471', 'a', 'u', 'c', 'q', '6463', '6717', '7025', '9359', 'q', 'h', '1989', '5497', 'h', 'd', 'c', '135', '5737', '1235', 'v', 'u', 'g', 'p', 't', '9223', '8289', '4489', 'n']
Example Output: a, c, d, g, h, l, n, p, q, r, t, u, v

Example Input: ['7217', 'z', 'j', '833', '7941', 'p', 'u', 'x', 'v', 'q', '3859', '9699', 'l', '9103', 'x', '6247', 'v', '1603', '5839', 'e', 'c', '6551', 't', '5137', '8745', '7889', '3797', 'd', '9541', 'a', '547', 'c', 'p', '4023', '3863', 't', '6299', '4157', '2059', '4163', '5453', '5327', '4837']
Example Output:
a, c, d, e, j, l, p, q, t, u, v, x, z