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: ['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']
Example Output: b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z

Example Input: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']
Example Output: b, d, f, g, j, l, m, v, y, z

Example Input: ['i', 'm', '5027', 'u', 'j', '2861', '6365', '2977', '4955', 'w', 'n', 'g', 'm', '4211', '5099']
Example Output:
g, i, j, m, n, u, w