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: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']

A: b, d, i, p, r, t, u, v, w, y, z
****
Q: ['i', '9575', '8995', 'm', 'o', '3015', '4005', '6909', '7195', '3361', 'j', '5253', '9523', '8879', '5861', 'e', 'y', 'e', '1525', 'i', '807', '8469', '3333', '4017', '2237', '3387', 'o', '643', 'p', '7129', '6243', 'y', '4913', 'z', 'f', '6909', 'f', '4347', '7227', 'o', 's', '9909', '8611']

A: e, f, i, j, m, o, p, s, y, z
****
Q: ['3089', '7001', '7435', '6727', 'q', '7759', '9965', 'f', 'f', '823', 'z', '5171', 'x', 'a', '4095', '8287', 't', 'e', '8319', 'y', '9881', '9523', '9459', 'j', '9249', 'a', '1011']

A:
a, e, f, j, q, t, x, y, z
****