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: ['5337', '4877', '9443', '3445', 'u', '2571', 't', 'n', 'x', '1985', '5145', '3397', 'p', '9259', 's', 'x', 'u', 'c', 'g', 't', 'j', '829', '8273', 'e', 'j', 'r', 'x', '865', '4773', 'h', '4407', '8591']

A: c, e, g, h, j, n, p, r, s, t, u, x
****
Q: ['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']

A: a, b, f, g, i, l, p, z
****
Q: ['d', '1079', 'e', '9319', '2843', '7735', 'x', '1935', 'z', '7969', 'j', '5499', 'p', 'u', 'x', 'm', 'f', 'w', '1353', '4629', 'l', 'v']

A:
d, e, f, j, l, m, p, u, v, w, x, z
****