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: ['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: ['w', 'n', '729', '2491', 'n', 'x', '915', '1869', 'z', '8491', '9947', '561', '829', 'n', 't', 'i']
Example Output: i, n, t, w, x, z

Example Input: ['9929', 'l', 'u', '8909', 'n', 'k', 'k', '1157', '7357', 'j', '4155', 'e', 'b', '4361', 'k', '1727', 'k', 'n', '1263', '9529', '8111', '2481', '2271', 'i', '7453', '7975', '7505', 'n', 'y', '5975', '3493', '5561']
Example Output:
b, e, i, j, k, l, n, u, y