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.

Ex Input:
['d', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']

Ex Output:
b, c, d, e, k, n, s, u, v, w


Ex Input:
['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']

Ex Output:
e, f, j, n, p, r, w, z


Ex Input:
['v', '2919', '5301', '4505', 'r', 'b', '8893', 'p', 'b', '3919', 'h', '5547', '1199', 'd', '8487', '4631', 'h', 'v', 'n', '4965', 'e', 'e', '9445', '8075', '9469', 'd', 'x']

Ex Output:

b, d, e, h, n, p, r, v, x