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: ['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']

A: b, d, i, j, q, r, s, v, w, x
****
Q: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']

A: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w
****
Q: ['i', 't', '1549', '2399', '3263', '2435', '8525', '9711', '2417', '7997', 'z', 'z', '6785', '4341', 'w', '6749', 'v', '7677', 'z', 'm', '8343', 'j', '3373', 'a', '6135', '9057', '5991', '8227', '6431', 'p', '1179', '729', '2841', 'p', 'z', 'u', '8313', 'b', 'n']

A:
a, b, i, j, m, n, p, t, u, v, w, z
****