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', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']
Example Output: b, c, d, e, j, k, l, p, s, t, u, w, y

Example Input: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
Example Output: c, i, m, n, p, z

Example Input: ['m', 'y', 'r']
Example Output:
m, r, y