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: ['2593', '1835', '5089', 'v', '9723', 'f', '9279', '4257', '2175', '655', 'q', 's', 'v', 'j', 'm', '4471', '6419', '1685', '2793', 'x', '509', 's', '4833', '2125', 'b', '6379', '1075']

Output: b, f, j, m, q, s, v, x


Input: Consider Input: ['4299', 'b', '4171', '7639', '6609', '927', '5249', 'o', 'p', '9851', 'e', '1311', '3777', '7799', '7687', '8809', 'c', 'r', '47', '1925', '1847', 'r', 'd', 'r', '1871', '5935', 'r', '2283', 'p', 'p', '2727', 'c', 'i', '7357', 'y', '5103', '6115', 'q', 'w', 'u', '9201', '4221', '7717', 'o']

Output: b, c, d, e, i, o, p, q, r, u, w, y


Input: Consider Input: ['w', '4947', 'p', 'd', 'm', 'u', '1049', 'x', 'v', '4923', '7863', 'o', 'c', '9743', 'y', 'r', 'x', '3269', 'u']


Output: c, d, m, o, p, r, u, v, w, x, y