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.

Input: Consider Input: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

Output: d, e


Input: Consider Input: ['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']

Output: f, h, j, n, u, w


Input: Consider Input: ['l', '477', '131', '6369', 'w', '7583', 'c', 'a', '2745', '4115', '8885', 'z', '6319', 'q', '5801', 'v', '4183', 'c', '5813', 'x', 'l', 't']


Output: a, c, l, q, t, v, w, x, z