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: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']

Output: d, h, i, j, k, n, o, t, v, w, x, z


Input: Consider Input: ['q', 'g', 's', 'g', 'z', '987', '777']

Output: g, q, s, z


Input: Consider Input: ['e', '7075', 'm', 'x', '8475', 'l', '7753', 'x', 's', '6919', 'l']


Output: e, l, m, s, x