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: ['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']

Output: a, n, u


Input: Consider Input: ['b', '4437', '1029', 'x', 'p', 'r', '4693', 'n', 'e', '3393', '337', 'k', '3779', 'y', 'z', '5657', 'u', '3719', '5171', '2541', '1113', 'g', 'j', 'y', '9957']


Output: b, e, g, j, k, n, p, r, u, x, y, z