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: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']

Output: a, b, c, j, l, r, t, v, x


Input: Consider Input: ['7911', '7175', 'y', '9173', 'y', '2529', '831', 'k', '7197', 'j', '2343', 'i', 'b', '6799', '5987', '7277', 'n', 'x', 'h', '7209', 'l', 'd', 'm', 'e', '2277', '8909', 'x', '5361']

Output: b, d, e, h, i, j, k, l, m, n, x, y


Input: Consider Input: ['u', 'n', 'h', '7775', '8927', '1999', '271', 'e', '59', '7117', 'b', 'b', '2013', '8529', '6427', '1051', '1783', '9963', '5893', '6353', 'r', 'i', '2587', 'k', '6113', 'j', 'y', '823']


Output: b, e, h, i, j, k, n, r, u, y