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: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
Example Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u

Example Input: ['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']
Example Output: a, d, e, j, k, l, m, q, t, u, x

Example Input: ['g', '671', '8495', '1333', '1965', 'c', '6211', 'w', '9763', 'x', '1313', 'k', 'e', 'd', 's', '3203', '8333', 'y', 'e', 'g', 'x']
Example Output:
c, d, e, g, k, s, w, x, y