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.

Q: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']

A: g, i, j, l, o, p, q, r, v
****
Q: ['y', 'b', 'r', 'f', '3745', 'n', '2921', '8133', 'r']

A: b, f, n, r, y
****
Q: ['6827', '3803', 'k', '9989', 'g', 'p', 'u', 'v', '6321', '4277', 'x', '9365', '5261', '4957', 'u', 'y', '1', 'i', '5303', 'x', '679', 't', '6629', '1937', '4457', 'w', '6961', '8647', 'g', 'o', '2999', 't', '3023', '9483', 'v', 'm', 'y', 'w', '4381']

A:
g, i, k, m, o, p, t, u, v, w, x, y
****