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: ['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']

A: c, e, h, i, p, r, t, u, w, z
****
Q: ['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']

A: p, q, y
****
Q: ['q', '2795', '1759', 'z', '2739', 'l', '5707', '3177', '1495', 'f', '3265', 'x', 'd', 'd', '1981', 'g', 'j', 'v', '989', '8695', '7073', '5065', '2893', '2957', 'u', 'd', '737', '1729', 'e', '1107', '1907', 't', 'w', 'h']

A:
d, e, f, g, h, j, l, q, t, u, v, w, x, z
****