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: ['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']

A: d, e, f, i, j, l, m, o, r, s, u, v, y
****
Q: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']

A: b, d, f, h, p, t, u, w, x, y, z
****
Q: ['l', '8321', 'u', 'r', '671', '8597', '221', '6465', 'n', '8469', '5983', '2971', '4365', '6433', '2443', 'a', 'i', 'm', 'l', '2559', '3939', '3801', '3595', 'r', 's', 'i', '3757']

A:
a, i, l, m, n, r, s, u
****