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: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']

A: a, d, f, g, i, j, k, m, n, s, u, v, x, y
****
Q: ['i', 's']

A: i, s
****
Q: ['t', 'w', '8733', '4105', 'b', 'u', 'a', 'q', 'z', 'u', 'n', 'n', '225', '3057', '2025', '7593', 'z', 'm', 'u', 'v', 'f', 'a', '4723', 'y']

A:
a, b, f, m, n, q, t, u, v, w, y, z
****