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.

['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']
b, d, e, f, n, o, p, q, r, v, w, z

['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
c, g, j, m, q, r, s, w

['711', '9311', '5605', 'x', 'h', 'y', 'w', '1543', '9781', '5285', '6987', 'a', 'f', 'm', 'c', 'z', '483', '5673', 'm', '6215', '3177', '585', 'w', '1379', 'p', 'i', '2201', 'z', '9063', 'm', 'd', '2249', 'o', '4147', 'f', 'h', 'c', '7497', '8451', '3695', 'm', 'z', '7717', '7907']

a, c, d, f, h, i, m, o, p, w, x, y, z