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.

Example Input: ['1707', '381', '3957', '7853', '4987']
Example Output: -1

Example Input: ['8741', 'h', '2147', '373', 'c', 'r', '2639', '3511', '1393', 't', '7173', 'f', '9371', '7659', 'q', '4799', 'f', '1967', '1905', '8783', 'i', 'n', 'z', '6395', 'u', 'i', '1493', '1395', '1909', '477', 'i', '8547', '393', '2203', '6893', 'y', '2085', '6445', '7753', '4027', 'h', 'y', '7963']
Example Output: c, f, h, i, n, q, r, t, u, y, z

Example Input: ['j', 'i', 't', '6701', 't', 'v', 'u', '3561', 'c', '4179', 'e', 'v', '495', 'q', '4965', '8123', 'i', 'z', 'r', 'c', 'k', '8093', '6589', 'c', '2021', 'x', '1773', '8937', '7589', '8833', 'b', 'x', '7253', 's', '2965', 'n', 'j', 'q', '8523', 'p', '9939', '4711']
Example Output:
b, c, e, i, j, k, n, p, q, r, s, t, u, v, x, z