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', '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']

Output: a, d, f, g, i, j, k, m, n, s, u, v, x, y


Input: Consider Input: ['9483', '501', 'j', 'k', '3103']

Output: j, k


Input: Consider Input: ['961', 'u', 't', 's', 'd', '2383', 'k', 'd', 'n', 'm', '245', '8287', '163', '5321', 'l', '4115', 's', '8011', '1633', 'p', '5685', '6935', '4019', '3371', '5195', 'w', '4499', 'h', '8955', '3561', 'c', 'm']


Output: c, d, h, k, l, m, n, p, s, t, u, w