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: ['u', '1805', 'l', 'l', '5449', 'r', '4471', 'a', 'u', 'c', 'q', '6463', '6717', '7025', '9359', 'q', 'h', '1989', '5497', 'h', 'd', 'c', '135', '5737', '1235', 'v', 'u', 'g', 'p', 't', '9223', '8289', '4489', 'n']

Output: a, c, d, g, h, l, n, p, q, r, t, u, v


Input: Consider Input: ['9013', 'e', 'm', 'p', 'k', '161', 'k']

Output: e, k, m, p


Input: Consider Input: ['e', '4897', '2483', '3059', '6407', 'c', '9389', 'e', 'i', '9663', 'n', 't', 'x', '6907', '8669', '169', 'u', 'j', '7395', '9411', 'p', 'w', 't', '3235', 'v', '879', '7149', '19', 's']


Output: c, e, i, j, n, p, s, t, u, v, w, x