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: ['1707', '381', '3957', '7853', '4987']

A: -1
****
Q: ['7889', '8357', 'u', '8333', '4677', '8271', '4345', '9199', '3723', '9571', '4181', 'i', '9671', 'd', '5293', '3551', 'j', '8471', '5877', 'z', '3681', 'm', 'i', 'l', 'u', 'l', '255', '1611', 'g', '3969', '7201', '8647', '9221', 's', '2957', '1255', '6481']

A:
d, g, i, j, l, m, s, u, z
****