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: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']

A: e, f, l, n, p, q, r, s, w, y
****
Q: ['i', '1129', 'f']

A: f, i
****
Q: ['e', '6845', '2891', 't', '4387', 'b', '8953', 'o', 'd', '4003', 'v', '8137', '6479', 'y', '1965', 'z', '8709', '513', '9425', 'a', 'l', 'i', '229', 'd', '559', 'g']

A:
a, b, d, e, g, i, l, o, t, v, y, z
****