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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']

A: c, d, e, f, l, n, p, q, t, u, v, y
****
Q: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']

A: a, d, f, g, k, l, m, n, p, q, s, v, w, z
****
Q: ['7679', 'c', '6413', 'k', '2435', '1529', 'y', 'g', 'u', 'j', '4545', 'l', 'r', 'e', 'c', '5019', '6325', 'q', '4713', 'v', 'j', 'k', 'r', '7181', 'g', '7295', '4831', '213', 'y', '2881', 'm', '9801', 'z', 'p', 'p', 'g', 'n', 'p', '5261', 'n', '4729']

A:
c, e, g, j, k, l, m, n, p, q, r, u, v, y, z
****