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: ['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']

A: a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z
****
Q: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

A: b, j, o, t, v, w
****
Q: ['6137', '7743', 'b', '1073', 'z', 'm', '8659', '811', '6327', '5121', '8447', '8007', '3433', '3583', '1931', '7017', 'o', 'm', '5393', 'r', '2195', 'e', '4547', '2073', '2791', 'e', 'v', '2909', 'i', '4183', '4771', '5997', '4699', 'e', 'z', '7753', '9361', '6057', 'x', 'j']

A:
b, e, i, j, m, o, r, v, x, z
****