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: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']

Output: b, l, r, v, y


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: ['1373', 'l', '1037', 't', '7619', '675', '7115', '2781', 'q', '8229', '5937', '3177', 'g', 'k', '6299', 'z', '7087', 'k', '439', 'a', '911', '603', 'b', 'a', '2279', '5471', 'e', 'u', 'h', '1595', 's', '3225', 'e', '2101', 'q', 'u', '3291']


Output: a, b, e, g, h, k, l, q, s, t, u, z