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: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']
Example Output: e, f, g, k, n, p, q

Example Input: ['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']
Example Output: b, e, l, m

Example Input: ['6889', '7675', 'n', 'k', '2987', 'f', '8965', '3041', 'r', 't', '8249', 'b', '1929', '7707', 'z', '1575', 'f', '1793', '2179', 'w', '7987', '3163', 'e', '235', '3967', '1655', '8029']
Example Output:
b, e, f, k, n, r, t, w, z