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: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
Example Output: e, h, l, m, n, o, t, y, z

Example Input: ['2527', '9123', '8717']
Example Output: -1

Example Input: ['6927', 'k', 'v', '6105', 'p', '7531', '3555', 'w', '2191', 'n', 'u', 'w']
Example Output:
k, n, p, u, v, w