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: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']

Output: a, c, i, j, n, r, t, v, x


Input: Consider Input: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']

Output: d, e, h, i, l, m, o, p, q, r, v


Input: Consider Input: ['8905', '2219', '5489', 'y', '1491', '5421', 'n', 'm', 'i', '7237', '5003', '5553', '3323', '375', '7369', 'b', 'v', '8489', 's', 'f', '3321', '7369', '8757', 'd', '1247', '8395', 'x', 'n', 'b', '9011', '883', 'd', 'o']


Output: b, d, f, i, m, n, o, s, v, x, y