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: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']
Example Output: a, c, e, o, r, s, z

Example Input: ['e', '8391', '7065', '6141', '3335', 't', 'i', 'c', '1791', '6333', 'b', 'z', '1621', 'e', 'h', 'u', 'o', 'q', '3195', '6507', '3253', 'c', '2067', '3917', '7111', 'r', 'j', 'd', '3987', '9139', 'm', '981', 'l', 'f', '2417', 'w', '9983', 'h', 'd', '6021', 'a', 'f']
Example Output: a, b, c, d, e, f, h, i, j, l, m, o, q, r, t, u, w, z

Example Input: ['m', 'm', 'l', 'v', '1767', '2601', 'z', '417', 'g', '1835', '8007', '485', '8089', '2659', '3783', '1771', 'c', 'l', '839', 'x', '3359', 'g', '6187', '1081', 'd', 'y', '8555', '9601', '6489', 'z', '1201']
Example Output:
c, d, g, l, m, v, x, y, z