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: ['y', 'i', '257', '3695', 's', '6717', '4817', '4117']
Example Output: i, s, y

Example Input: ['j', '425', '6223', '6631', 'y', '7649', 'r', 'a', '7933', '7947', 'l', 'l', '8755', 'g', 'b', '3351', '49', 'v', 'm', 'x', '3291', '1007', '1401', 'z', 'q', 'a']
Example Output: a, b, g, j, l, m, q, r, v, x, y, z

Example Input: ['i', '2423', '5251', '291', '8395', 'z', 'u', '1959', 's', '4687', '3521', '7407', 'b', '35', '8525', '9843', '729', '1493', '5643', 'o', '8865', '6789', '165', 'o', 'l', 'w', 'x', 'c']
Example Output:
b, c, i, l, o, s, u, w, x, z