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: ['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']
Example Output: c, e, h, i, p, r, t, u, w, z

Example Input: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
Example Output: a, d, f, g, i, j, k, m, n, s, u, v, x, y

Example Input: ['7101', 'v', '5711', 'e', 'h', 'q', 'i', '7095', 'z', '7351', 'j', '5657', 'x', 't', '2159', 'k', '3589', 'g', 'u', 'h', 'r', 'u', 'g', 'v', '6541', '7819', '1895', 't', 'r', 's', '3855', '2543', 'c', 'g', '4675', 'l', '2949', 'n', 'x', 'c', '4121', 'v', '9687', 'j']
Example Output:
c, e, g, h, i, j, k, l, n, q, r, s, t, u, v, x, z