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: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']

A: d, e, g, l, m, o, p, q, s, t, v
****
Q: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']

A: f, l, r, w, x, z
****
Q: ['9991', '1697', '8845', 'l', '551', '5615', 'e', 'x', 'f', '4869', '2771', 'h', '3669', '421', '4479', 'j', 'z', 'i', '6885', 'z', '115', '9459', '9743', '917', 'r', '9483', '4233', 'y', '3499', 'n', 't', '5851', '4603', '6369', '1575', 'd']

A:
d, e, f, h, i, j, l, n, r, t, x, y, z
****