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]: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
[EX A]: c, i, m, v

[EX Q]: ['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']
[EX A]: a, b, d, e, f, i, j, m, n, p, r, s, u, v, z

[EX Q]: ['3333', '1561', '7707', '6451', '2133', '2653', 'q', 'z', '7463', 'j', '8649', '9975', '7305', 'j', '1329', 'u', 'r', '6647']
[EX A]:
j, q, r, u, z