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: ['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']

A: b, e, f, h, m, n, p, q, u, v, x, z
****
Q: ['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']

A: b, d, f, g, j, l, m, v, y, z
****
Q: ['8165', 'q', 'u', 'r', '8813', '4985', 'j', '3643', 'u', '329', 'a', 'f', '2877', 'k']

A:
a, f, j, k, q, r, u
****