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.

Q: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']

A: e, k, l, m, n, v, z
****
Q: ['k', 'c', 'i']

A: c, i, k
****
Q: ['y', '987', '681', 'm', '5737', 't', '7645', 'b', '7243', 'b', '5765', 'g', '7837', '1235', '3549', 'i', '5155', '6315', '7923', 'j', 'b', '7215', 'v', 'z', 'n', '6273', '7561', '401', 'h', 'r', '3075', '7489', '1327']

A:
b, g, h, i, j, m, n, r, t, v, y, z
****