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: ['o', 'd', '6495', '5211', '341', 'v', '385', 'v', 'g', 'v', 'l', '7631', '2675', 't']

A: d, g, l, o, t, v
****
Q: ['q', '9033', 'p', 'z', '1743', '247', '967', '445', '9849', 'f', '9113', 'b', 'g', '6041', 'j', '927', 'i', 'p', '6821', 'q', '6701', 'f', 'j', 'o', 'y', 'c', '7981', 'b']

A: b, c, f, g, i, j, o, p, q, y, z
****
Q: ['3551', 'm', 'b', '4517', '4251', '6221', 's', 'z', 'b', 'p', '859', '1547', 'r', '8389', '5583', '5515', 's', 'd', '1999', 'e', '8955', 'z', 'j', '3001', 'k', 'r', 'c', 'u', 'k', '4779', 'f', '6637', '31', '6451', '8525', '547', '6025', 'z', '6069', 'f', 'o', 'd', 'u', '6461', '2737']

A:
b, c, d, e, f, j, k, m, o, p, r, s, u, z
****