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: ['8451', 'x', '9965', '9303', 'm', 'f', '4205', 'y', 'n', '8521', '9995', 'z', 's', '3519', 'k', 'e', 'o', 'k', '9611', 'q', 'l', 'p', '3339', '4023', 'n', 'd', '8903', 'a', 'k', 'u', '4009', 'e', 'm', '989', '4495']

A: a, d, e, f, k, l, m, n, o, p, q, s, u, x, y, z
****
Q: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

A: b, i, k, u, z
****
Q: ['6997', '8729', '2719', '357', 'w', '4617', 'p', '9517', 'e', 'w', '5885', 'u', 'p', '3685', 'r', 'd']

A:
d, e, p, r, u, w
****