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.

[EX Q]: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']
[EX A]: a, b, c, f, g, h, j, k, p, r, v, w, x, y

[EX Q]: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
[EX A]: a, j, l, q, y, z

[EX Q]: ['9307', 'g', 'k', 'n', '6615', '3283', '787', '3917', '2285', 'h', 'u', '5643', 'e', '3765', 'g', '2913', '1235', 'u', '9445', 'h', '9159', 'q', '9817', '339', '7515', '2667', 'n']
[EX A]:
e, g, h, k, n, q, u