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]: ['7073', 'd', 'e']
[EX A]: d, e

[EX Q]: ['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']
[EX A]: a, b, d, g, h, i, j, k, l, m, n, p, r, w

[EX Q]: ['m', '9923', '8515', 's', 'y', '3939', 'x', 't', 'c', '3305', 'e', 'j', 'k', '6667', '121', '7799', 'c', 'j', 'c', '3143', 'j', '2261', 'i', 'h', '9571', '2799', 'b', '4873', '6797', 'm', '4085', 'a', 'i', 'd', '317', 'c', '1017', '8591', '1571', '3441', '2393']
[EX A]:
a, b, c, d, e, h, i, j, k, m, s, t, x, y