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: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']

Output: a, c, h, i, j, k, r, s, u


Input: Consider Input: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']

Output: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v


Input: Consider Input: ['9917', '5605', 'i', 'q', 'q', 'l', 'n', 'f', '8895', 'l', 'b', '6001', '8851', 'p', 's']


Output: b, f, i, l, n, p, q, s