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: ['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']
Example Output: c, d, k, p, s, t, w, x, z

Example Input: ['k', 'c', 'i']
Example Output: c, i, k

Example Input: ['9083', 'j', 'g']
Example Output:
g, j