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: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']
Example Output: a, g, k, l, o, p, q, r, s, w, x

Example Input: ['q', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']
Example Output: a, c, e, g, h, i, l, m, p, q, t, v, w, x, y

Example Input: ['1881', 'e', '9445', 's', 'u', '5607', 'q', 'k', '853', 'w', '821', '7825', 'h', 'z', '2083', '841', '5797', 'g', 'g', '8401', '3581', '8167', '5921', 'b', '9989', 'k', '3407', '1479', 'g', '4611', '811', 'o', 'n', 'y', '9513', 'o', '4017', 'z', '6037', '3519', '125', '3887', '8625', 'c']
Example Output:
b, c, e, g, h, k, n, o, q, s, u, w, y, z