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: ['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']
Example Output: b, d, f, m, o, p, r, v, x, y

Example Input: ['c', '8389', 'j', '6113', '5843', 'f']
Example Output: c, f, j

Example Input: ['4823', '8227', 'y']
Example Output:
y