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.

Input: Consider Input: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']

Output: b, e, f, g, k, l, n, q, v, w, y


Input: Consider Input: ['o', 'c', '6469', 'x', '8815', '4441', '6193', 'u', 'm', 'a', '9879', 'p', '8335', 'c', 'z']

Output: a, c, m, o, p, u, x, z


Input: Consider Input: ['j', '6213', 'l', '4281', 'f', 'k', 'k', '6379', '1609', '9647', '2355', 'z', 'p', '4803', 'b', 'q', '4927', '8313', 'm', 'j', 'u', '8633', '4269', 'w', '9523', 's', '8971']


Output: b, f, j, k, l, m, p, q, s, u, w, z