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: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']

A: f, i, k, n, q, r, s, w, y
****
Q: ['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']

A: a, c, d, e, f, g, h, j, k, m, n, o, u, v, z
****
Q: ['k', '7387', '9041', '5535', 'o', 'v', 's', 'i', '5503', '6461', '7047', 'e', '9433', '6187', '1845', 'k', 'i', '2019', '9463', 'd', 'l', 'm', '2609', '3127', '557', '6921', '3197', 'j', '7967', '4063', 'c', '6803']

A:
c, d, e, i, j, k, l, m, o, s, v
****